Non-Communicable Diseases — MCQs

Non-Communicable Diseases Indian Medical PG Practice Questions and MCQs

Question 111: The crude death rate is an indicator that shows the relationship between which two factors?

A. Population and total mortality (Correct Answer)
B. Population and proportional mortality
C. Population and age-specific mortality
D. None of the above

Explanation: ### Explanation **1. Why Option A is Correct:** The **Crude Death Rate (CDR)** is the simplest and most common measure of mortality in a population. It represents the number of deaths occurring during a specific year per 1,000 mid-year population. The formula is: $$\text{CDR} = \frac{\text{Total number of deaths during the year}}{\text{Estimated mid-year population}} \times 1000$$ By definition, it relates **total mortality** (all deaths regardless of cause) to the **total population** at risk. It is termed "crude" because it does not account for the age or sex composition of the population. **2. Why Other Options are Incorrect:** * **Option B (Proportional Mortality):** This relates the number of deaths due to a *specific cause* to the *total number of deaths* (not the total population). It is used to identify the leading causes of death within a group. * **Option C (Age-specific Mortality):** This relates the number of deaths in a *specific age group* to the *total population of that same age group*. It is a more refined indicator than CDR for comparing health status across different demographics. **3. NEET-PG High-Yield Pearls:** * **Denominator:** The denominator for CDR is always the **Mid-Year Population** (as of July 1st), which serves as an estimate of the average population at risk during the year. * **Limitation:** CDR is heavily influenced by the **age structure** of a population. A developed country with an aging population may have a higher CDR than a developing country with a younger population, even if health services are better. * **Standardization:** To compare mortality between two different populations, **Age-Standardized Death Rates** must be used to eliminate the confounding effect of age. * **Current Trend:** In India, the CDR has significantly declined over the decades due to improved public health measures.

Question 112: What is the most common cause of epidemic infective hepatitis?

A. Hepatitis A Virus (HAV)
B. Hepatitis B Virus (HBV)
C. Hepatitis C Virus (HCV)
D. Hepatitis E Virus (HEV) (Correct Answer)

Explanation: **Explanation:** The correct answer is **Hepatitis E Virus (HEV)**. In the context of public health and epidemiology, "epidemic" refers to a sudden increase in cases within a population. HEV is the most common cause of large-scale, water-borne epidemics of infective hepatitis in developing countries, including India. It is primarily transmitted via the **fecal-oral route**, often through contaminated drinking water. **Analysis of Options:** * **Hepatitis E (HEV):** It is the leading cause of both sporadic and epidemic viral hepatitis in India. It typically affects young adults and is notorious for causing high mortality (up to 20%) in **pregnant women** due to fulminant hepatic failure. * **Hepatitis A (HAV):** While also transmitted via the fecal-oral route, HAV is more commonly associated with **sporadic cases** and small clusters/outbreaks among children. In endemic areas, most children develop immunity early in life, making large-scale adult epidemics less common than HEV. * **Hepatitis B (HBV) & C (HCV):** These are transmitted via parenteral, sexual, or perinatal routes. They do not cause water-borne epidemics; instead, they are major causes of **chronic** hepatitis, cirrhosis, and hepatocellular carcinoma. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of acute viral hepatitis in India:** HEV (followed by HAV). * **Incubation Period:** HEV (2–8 weeks); HAV (2–6 weeks). * **Pregnancy Warning:** HEV in the 3rd trimester carries the highest risk of fulminant hepatitis. * **Zoonotic potential:** HEV Genotype 3 and 4 are associated with consumption of undercooked pork. * **Chronicity:** HEV generally does not cause chronic infection, except in immunocompromised individuals (e.g., organ transplant recipients).

Question 113: Which disease is primarily associated with rats?

A. Leptospirosis (Correct Answer)
B. Measles
C. Tetanus
D. Influenza

Explanation: **Explanation:** **Leptospirosis** is the correct answer because it is a classic zoonotic disease caused by the spirochete *Leptospira interrogans*. Rats (specifically the brown rat, *Rattus norvegicus*) are the most important **reservoir hosts**. The bacteria colonize the renal tubules of the rats and are excreted in their **urine**. Humans typically contract the infection through direct contact with contaminated water or moist soil (often during floods or agricultural work) via skin abrasions or mucous membranes. **Analysis of Incorrect Options:** * **Measles:** A highly contagious viral infection caused by the Rubeola virus. It is an exclusively human disease with no animal reservoir. * **Tetanus:** Caused by *Clostridium tetani* spores found in soil and animal feces (commonly horses/cattle). It is not "associated with rats" but rather with contaminated wounds. * **Influenza:** While some strains are zoonotic (birds/pigs), the common seasonal influenza is primarily a human-to-human respiratory infection. **High-Yield Clinical Pearls for NEET-PG:** * **Weil’s Disease:** The severe triad of Leptospirosis characterized by **jaundice, renal failure, and hemorrhage**. * **Occupational Hazard:** High risk in sewage workers, farmers, and miners. * **Incubation Period:** Usually 10 days (Range: 2–30 days). * **Drug of Choice:** **Doxycycline** is used for prophylaxis; **Penicillin G** is the treatment of choice for severe cases. * **Gold Standard Test:** Microscopic Agglutination Test (MAT).

Question 114: A measles epidemic can be anticipated when the proportion of susceptible children in a community reaches which percentage?

A. 20%
B. 40% (Correct Answer)
C. 60%
D. 80%

Explanation: ### Explanation **Concept: The Threshold of Herd Immunity in Measles** Measles is one of the most highly infectious diseases known, with a Basic Reproduction Number ($R_0$) typically ranging between 12 and 18. To prevent an epidemic, a very high level of herd immunity (90–95%) is required. In epidemiological terms, an epidemic is triggered when the **"critical mass" of susceptible individuals** reaches a specific threshold. For measles, it has been traditionally observed that an outbreak or epidemic becomes imminent when the proportion of susceptible children in the community reaches **40%**. At this point, the chain of transmission can no longer be contained by the existing immune population, leading to rapid spread. **Analysis of Options:** * **40% (Correct):** This is the established epidemiological threshold for measles. When 60% of the population is immune (and 40% susceptible), the density of susceptible hosts is high enough to sustain an epidemic. * **20% (Incorrect):** At 20% susceptibility (80% immunity), small clusters may occur, but a full-scale epidemic is usually averted due to partial herd effect. * **60% & 80% (Incorrect):** These levels represent extreme vulnerability. While an epidemic would certainly occur at these percentages, the *earliest* point at which an epidemic is anticipated is the 40% mark. **High-Yield Clinical Pearls for NEET-PG:** * **Herd Immunity Threshold ($HIT$):** Calculated as $1 - 1/R_0$. For measles, since $R_0$ is ~15, the $HIT$ is approximately 94%. * **Secondary Attack Rate (SAR):** Measles has a SAR of >90% among susceptible household contacts. * **Eradication vs. Elimination:** Measles is a candidate for eradication because there is no animal reservoir and an effective vaccine exists. * **Vaccine Timing:** Under the National Immunization Schedule (NIS), the 1st dose is given at 9 months and the 2nd dose at 16–24 months.

Question 115: According to national control programmes for non-communicable diseases, which of the following statements is FALSE?

A. According to WHO, Coronary Heart disease is considered a modern epidemic, a disease that affects the population, and not an unavoidable attribute of aging.
B. According to the stroke control programme, the first priority is given to controlling diabetes, eliminating smoking, and preventing and managing other risk factors. (Correct Answer)
C. Cancer is characterized by abnormal cell growth, the ability to invade adjacent tissues and distant organs, leading to the eventual death of the affected person if the tumor has progressed significantly. The DALYs lost worldwide due to cancer are 77.812.
D. Diabetes is an 'iceberg' disease. The increase in both prevalence and incidence of type 2 DM globally is associated with industrialization and socio-economic development.

Explanation: ### Explanation **1. Why Option B is the Correct (False) Statement:** In the context of stroke control and prevention, the **first priority** is the control of **Hypertension (High Blood Pressure)**. Hypertension is the most significant and modifiable risk factor for both ischemic and hemorrhagic strokes. While managing diabetes and smoking (Option B) are crucial components of secondary prevention and overall cardiovascular health, they are secondary to blood pressure management in public health guidelines for stroke reduction. **2. Analysis of Other Options:** * **Option A (True):** The WHO classifies Coronary Heart Disease (CHD) as a "modern epidemic." It emphasizes that CHD is a result of lifestyle factors and environmental influences rather than an inevitable consequence of getting older. * **Option C (True):** This is the standard pathological definition of cancer. The figure of **77.8 million (77,812 in thousands)** DALYs (Disability-Adjusted Life Years) is a recognized global burden metric cited in standard textbooks like Park’s Preventive and Social Medicine. * **Option D (True):** Diabetes is a classic "iceberg disease" because the number of undiagnosed cases (submerged portion) far exceeds the diagnosed cases (visible tip). Its rise is directly linked to the "coca-colonization" of diets and sedentary lifestyles accompanying industrialization. **3. High-Yield Clinical Pearls for NEET-PG:** * **Rule of Halves (Hypertension):** Half the people with HTN are unaware; half of those aware are not on treatment; half of those on treatment are not controlled. * **Stroke Prevention:** Primary prevention focuses on lifestyle; secondary prevention focuses on the "Big Three": Hypertension, Smoking, and Diabetes (in that order of priority for stroke). * **Iceberg Phenomenon:** Seen in Diabetes, Hypertension, Malnutrition, and Mental Illness. It is **NOT** seen in Rabies, Tetanus, or Measles (where clinical cases are obvious). * **NPCDCS:** The national program in India is now renamed **NP-NCD** (National Programme for Prevention & Control of Non-Communicable Diseases).

Question 116: What is the most common cancer affecting both males and females globally?

A. Cancer of the pancreas
B. Buccal mucosa cancer
C. Lung cancer (Correct Answer)
D. Colo-rectal cancer

Explanation: **Explanation:** **Correct Option: C. Lung cancer** According to the latest **GLOBOCAN** data (WHO), **Lung Cancer** remains the most common cancer globally when considering both sexes combined. It accounts for approximately 12.4% of all new cancer cases and is also the leading cause of cancer-related mortality worldwide. The high incidence is primarily attributed to the global prevalence of tobacco smoking and increasing environmental air pollution. **Analysis of Incorrect Options:** * **A. Cancer of the pancreas:** While highly lethal with a poor prognosis, it does not rank among the top five most common cancers globally. * **B. Buccal mucosa cancer:** This is a subset of Oral Cancer. While it is highly prevalent in **India** (due to tobacco and betel nut chewing), it is not the most common cancer on a global scale. * **D. Colo-rectal cancer:** This is the third most common cancer globally. While its incidence is rising due to dietary shifts and sedentary lifestyles, it still trails behind lung and breast cancer. **High-Yield Clinical Pearls for NEET-PG:** * **Global Scenario:** Most common cancer (Both sexes) = **Lung Cancer**. (Note: Breast cancer recently fluctuated with Lung for the #1 spot, but Lung remains the most common cause of *death*). * **Indian Scenario:** Most common cancer (Both sexes) = **Breast Cancer**. * **Indian Males:** Most common cancer = **Lip/Oral Cavity** (specifically Buccal Mucosa). * **Indian Females:** Most common cancer = **Breast Cancer** (followed by Cervix). * **Global Mortality:** Lung cancer is the #1 killer among all cancers.

Question 117: Which of the following is NOT included in the syndromic approach to sexually transmitted diseases?

A. Genital ulcers
B. Urethral discharge in males
C. Dysuria in women (Correct Answer)
D. Vaginal discharge

Explanation: The **Syndromic Approach** to Sexually Transmitted Infections (STIs) is a strategy developed by the WHO and adopted by NACO (National AIDS Control Organisation) in India. It relies on identifying a group of symptoms and signs (syndromes) to provide immediate, effective treatment without waiting for laboratory confirmation. ### **Explanation of the Correct Answer** **C. Dysuria in women:** Under the NACO guidelines, dysuria (painful urination) in women is **not** treated as a standalone STI syndrome. In women, dysuria is more commonly associated with Urinary Tract Infections (UTIs) rather than STIs. While dysuria in *males* is often linked to urethral discharge (STI), in females, the syndromic management focuses on vaginal discharge or lower abdominal pain. ### **Analysis of Incorrect Options** * **A. Genital ulcers:** This is a core syndrome managed under the NACO guidelines. It is categorized into **Non-herpetic** (Syphilis, Chancroid) treated with Kit 3 or 4, and **Herpetic** (Genital Herpes) treated with Kit 5. * **B. Urethral discharge in males:** This is a classic syndrome (Kit 1) characterized by discharge and often accompanied by dysuria. In males, dysuria is a significant indicator of urethritis. * **D. Vaginal discharge:** This is the most common syndrome in females (Kit 2), covering infections like Bacterial Vaginosis, Candidiasis, and Trichomoniasis. ### **High-Yield NEET-PG Pearls** * **NACO Color-Coded Kits:** * **Kit 1 (Grey):** Urethral discharge, Anorectal discharge, Cervicitis. * **Kit 2 (Green):** Vaginal discharge. * **Kit 3 (White):** Genital Ulcer (Non-herpetic) - Penicillin allergic. * **Kit 4 (Blue):** Genital Ulcer (Non-herpetic) - Non-allergic. * **Kit 5 (Red):** Genital Ulcer (Herpetic). * **Kit 6 (Yellow):** Lower Abdominal Pain (PID). * **Kit 7 (Black):** Inguinal Bubo. * **Key Concept:** The syndromic approach prioritizes **sensitivity** over specificity to ensure no case is missed in resource-limited settings.

Question 118: Which of the following is NOT a measurement used for the assessment of obesity?

A. Quetelet's index
B. Broca index
C. Corpulence index
D. Sullivan's index (Correct Answer)

Explanation: ### Explanation The correct answer is **D. Sullivan’s Index**. #### 1. Why Sullivan’s Index is the Correct Answer Sullivan’s index is a measure of **disability-free life expectancy**. It is calculated by subtracting the duration of disability/sickness from the total life expectancy. It is a key indicator of the **quality of life** and population health status, rather than a physical measurement of body fat or obesity. #### 2. Analysis of Incorrect Options (Obesity Indices) * **A. Quetelet’s Index:** This is the most common name for the **Body Mass Index (BMI)**. It is calculated as $Weight (kg) / Height (m^2)$. * **B. Broca Index:** A simple formula used to estimate ideal body weight. * *Formula:* $Height (cm) - 100$. * Example: For a person 170 cm tall, the ideal weight is 70 kg. * **C. Corpulence Index (Ponderal Index):** Similar to BMI but uses the cube of the height. * *Formula:* $Weight (kg) / Height (m^3)$. It is often used in pediatrics to assess neonates. #### 3. High-Yield Clinical Pearls for NEET-PG * **Best indicator of abdominal obesity:** Waist-to-Hip Ratio (WHR). A ratio **>0.9 in men** and **>0.85 in women** indicates central obesity. * **Waist Circumference:** A high-yield predictor of metabolic risk. Action is needed if $>90$ cm in Indian men or $>80$ cm in Indian women. * **Skinfold Thickness:** Measured using **Harpenden Calipers** (most commonly at the triceps). * **Obesity Classification (WHO):** * Overweight: BMI 25–29.9 * Obese: BMI $\geq 30$ * *Note:* For Asians/Indians, the cutoff for overweight is lower ($\geq 23$) and obesity is $\geq 25$.

Question 119: In the nineteenth century, McKeon studied the decline in the incidence of infectious diseases like tuberculosis and explained the correlation. The relation between the decline in infectious disease incidence and its causes is better understood in terms of what factors?

A. Increased awareness and knowledge
B. Social and economic factors (Correct Answer)
C. Behavioral interventions
D. Medical interventions

Explanation: ### Explanation **Thomas McKeown**, a renowned social medicine expert, analyzed the decline of mortality in England and Wales during the 19th century. His findings, known as the **McKeown Thesis**, are a cornerstone of public health history. **1. Why Social and Economic Factors are Correct:** McKeown demonstrated that the significant decline in mortality from infectious diseases (like Tuberculosis, Cholera, and Measles) occurred **long before** the advent of specific medical treatments like antibiotics or mass immunization programs. He attributed this decline primarily to **improved living standards**, specifically: * **Better Nutrition:** Increased host resistance due to improved food supply. * **Environmental Sanitation:** Better water supply and sewage disposal. * **Improved Housing:** Reduced overcrowding, which limited the spread of airborne pathogens. These are all fundamental **social and economic determinants of health**. **2. Why Other Options are Incorrect:** * **Medical Interventions (D):** This is the most common distractor. McKeown argued that effective medical treatments (e.g., Streptomycin for TB) and vaccines were introduced only after the majority of the decline had already occurred. * **Increased Awareness (A) & Behavioral Interventions (C):** While health education is vital today, during the 19th century, the shift was driven by structural societal changes and the Industrial Revolution's economic progress rather than individual behavioral changes or health literacy. **3. NEET-PG High-Yield Pearls:** * **The McKeown Thesis** emphasizes that "Medicine is a social science." * **Tuberculosis Trend:** Mortality from TB started falling in the 1830s; the BCG vaccine and Streptomycin were not available until the 1940s. * **Concept of "Social Medicine":** It highlights that social factors are more influential on population health than clinical medicine alone. * **Key takeaway:** Improvements in the **Standard of Living** are the most potent "preventive medicine" for infectious diseases in a developing society.

Question 120: What does STEPS stand for?

A. Communicable diseases
B. Noncommunicable diseases (Correct Answer)
C. Both
D. None

Explanation: **Explanation:** The **WHO STEPwise approach to Surveillance (STEPS)** is a standardized method for collecting, analyzing, and disseminating data on **Non-Communicable Diseases (NCDs)** and their risk factors. It was developed by the World Health Organization to help countries build and strengthen their surveillance systems to monitor the growing burden of chronic diseases. **Why Option B is Correct:** The STEPS framework is specifically designed to track the major risk factors that lead to NCDs (such as cardiovascular diseases, diabetes, and cancers). It focuses on three "steps" of data collection: * **Step 1:** Questionnaire-based (Self-reported data on tobacco/alcohol use, diet, and physical inactivity). * **Step 2:** Physical measurements (Blood pressure, height, weight, and waist circumference). * **Step 3:** Biochemical measurements (Blood glucose and cholesterol levels). **Why Other Options are Incorrect:** * **Option A:** Communicable diseases are monitored through different surveillance systems (like IDSP in India) that focus on pathogen detection, outbreak investigation, and immunization coverage, rather than lifestyle risk factors. * **Option C & D:** Since STEPS is a specialized tool exclusively for NCD risk factors, these options are incorrect. **High-Yield Clinical Pearls for NEET-PG:** * **Goal:** To provide a "stepwise" approach that is flexible enough for low- and middle-income countries to implement. * **Core Risk Factors:** STEPS monitors 8 core risk factors: Tobacco use, alcohol use, low fruit/vegetable intake, physical inactivity, obesity, raised BP, raised blood glucose, and abnormal blood lipids. * **Global Burden:** NCDs are currently the leading cause of death globally; hence, STEPS data is crucial for policy-making and the **National Programme for Prevention and Control of Cancer, Diabetes, Cardiovascular Diseases and Stroke (NPCDCS)**.

Practice by Chapter

Epidemiology of NCDs

Practice Questions

Cardiovascular Disease Prevention

Practice Questions

Diabetes Control Program

Practice Questions

Cancer Screening and Control

Practice Questions

Chronic Respiratory Diseases

Practice Questions

Mental Health Program

Practice Questions

Blindness Control Program

Practice Questions

Accident and Injury Prevention

Practice Questions

NCD Risk Factor Surveillance

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National Program for Prevention and Control of Cancer, Diabetes, CVD, and Stroke

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Oral Health Program

Practice Questions

Geriatric Health Issues

Practice Questions

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