Non-Communicable Diseases Practice Questions

Q: What is the annual risk of developing breast cancer detected by mammography?

1%. **Explanation:** The correct answer is **1% (Option A)**. This figure refers to the **cancer detection rate** in asymptomatic women undergoing routine screening mammography. In a standard screening population (women aged 40–70), approximately 10% of mammograms are flagged as abnormal, necessitating further investigation. However, only about 10% of those flagged actually result in a diagnosis of malignancy. Therefore, the overall annual yield of screening mammography is approximately **1 in 100 women (1%)**. **Analysis of Incorrect Options:** * **Option B (0.01%):** This value is far too low. It would imply that only 1 in 10,000 women screened has cancer, which would make mass screening programs clinically and economically non-viable. * **Option C & D (2% and 2.5%):** These figures overestimate the annual detection rate in a general screening population. While the *lifetime* risk of developing breast cancer is much higher (approx. 12% or 1 in 8), the *annual* detection rate via mammography remains steady at roughly 1%. **High-Yield Clinical Pearls for NEET-PG:** * **Sensitivity:** Mammography has a sensitivity of 70–90%. It is less sensitive in young women due to **dense breast tissue** (BI-RADS composition category C and D). * **BI-RADS Scoring:** Remember the management for BI-RADS 3 (Probably benign; 6-month follow-up), BI-RADS 4 (Suspicious; biopsy required), and BI-RADS 5 (Highly suggestive of malignancy; definitive action required). * **Screening Guidelines:** Most international guidelines recommend annual or biennial screening starting at age 40 or 50. * **Microcalcifications:** The most common mammographic sign of **Ductal Carcinoma in Situ (DCIS)** is pleomorphic microcalcifications.

Q: High incidence of oral malignancies is attributed to which of the following factors?

Use of pan. **Explanation:** The primary risk factor for oral malignancies, particularly in the Indian subcontinent, is the chronic use of **Pan (betel quid)**. Pan typically contains betel leaf, areca nut, slaked lime, and often tobacco. The underlying medical mechanism involves both chemical and mechanical irritation. **Areca nut** contains alkaloids (like arecoline) that induce fibroblastic proliferation, leading to **Oral Submucous Fibrosis (OSMF)**, a potent premalignant condition. When combined with **tobacco**, the nitrosamines act as potent carcinogens, causing DNA damage and squamous cell carcinoma. **Analysis of Options:** * **Option A (Correct):** Pan chewing is the single most significant epidemiological factor in South Asia, leading to a high "field cancerization" effect in the oral cavity. * **Option B (Incorrect):** While poor oral hygiene and jagged teeth can cause chronic mechanical trauma (leading to ulcers), they are considered secondary or contributory factors rather than the primary driver of high incidence. * **Option C (Incorrect):** HPV (specifically strains 16 and 18) is strongly associated with **Oropharyngeal cancer** (tonsils and base of tongue), but in the Indian context, oral cavity proper cancers are overwhelmingly linked to chewable tobacco. * **Option D (Incorrect):** Poor nutrition (e.g., Vitamin A and iron deficiency/Plummer-Vinson syndrome) predisposes to mucosal atrophy, but it is not the leading cause compared to direct carcinogen exposure. **Clinical Pearls for NEET-PG:** * **Most common site** of oral cancer in India: **Buccal mucosa** (due to the "tobacco pouch" habit). * **Most common histological type:** Squamous Cell Carcinoma (SCC). * **Premalignant conditions:** Erythroplakia (highest transformation risk), Leukoplakia, and OSMF. * **Field Cancerization:** A concept where the entire mucosal surface exposed to a carcinogen is at risk of developing multiple primary tumors.

Q: Which of the following is the best indicator of cardiovascular disease risk?

Waist to hip ratio. **Explanation:** The **Waist-to-Hip Ratio (WHR)** is considered the best clinical indicator of cardiovascular disease (CVD) risk among the given options because it specifically measures **central (android) obesity**. Unlike total body fat, visceral fat stored in the abdominal region is metabolically active and strongly associated with insulin resistance, dyslipidemia, and systemic inflammation—the primary drivers of atherosclerosis and coronary heart disease. **Analysis of Options:** * **Waist-to-Hip Ratio (WHR):** It reflects the distribution of fat. A WHR >0.9 in men and >0.85 in women is a significant predictor of myocardial infarction and metabolic syndrome. * **Body Mass Index (BMI):** While widely used, BMI is a measure of "excess weight" rather than "excess fat." It cannot distinguish between muscle mass and adipose tissue, nor does it account for fat distribution. * **Waist Circumference (WC):** This is a good indicator of abdominal fat, but it does not account for the individual’s overall body frame or pelvic structure as accurately as the ratio does. * **Skinfold Thickness:** This measures subcutaneous fat (fat under the skin) using calipers. While useful for estimating total body fat percentage, it is less predictive of internal visceral fat and long-term cardiovascular outcomes. **High-Yield Clinical Pearls for NEET-PG:** * **WHO Cut-offs for WHR:** >0.90 (Males) and >0.85 (Females) indicate abdominal obesity. * **Metabolic Syndrome (ATP III Criteria):** Waist circumference is the preferred parameter (>102 cm in men, >88 cm in women; for Asians, it is >90 cm in men and >80 cm in women). * **Ponderal Index:** $Weight / Height^3$; used primarily in neonatology to assess intrauterine growth retardation. * **Quetelet’s Index:** Another name for BMI ($Weight / Height^2$).

Q: Based on epidemiological studies, which of the following has been found to be most protective against colon cancer?

High fiber diet. **Explanation:** The relationship between diet and colorectal cancer is a high-yield topic in Community Medicine. **1. Why "High fiber diet" is correct:** Epidemiological studies consistently show that a high-fiber diet (found in fruits, vegetables, and whole grains) is the most significant protective factor against colon cancer. The underlying medical mechanisms include: * **Dilution:** Fiber increases fecal bulk, diluting potential carcinogens in the colon. * **Transit Time:** It speeds up the passage of stool, reducing the time the colonic mucosa is exposed to harmful substances. * **Fermentation:** Gut bacteria ferment fiber into short-chain fatty acids (like butyrate), which have anti-inflammatory and anti-neoplastic properties. **2. Analysis of Incorrect Options:** * **Low fat diet:** While high intake of saturated animal fats is a known *risk factor* (as it increases bile acid secretion which can be converted into carcinogens), the protective effect of reducing fat is statistically less robust than the protective effect of increasing fiber. * **Low selenium diet:** This is incorrect because Selenium is actually an antioxidant. Therefore, a **high** selenium intake (not low) is considered protective against various cancers. * **Low protein diet:** There is no strong evidence that a low-protein diet is protective. However, a diet high in **red meat and processed meats** is a significant risk factor for colon cancer. **3. NEET-PG High-Yield Pearls:** * **Most common site of Colon Cancer:** Sigmoid colon (globally), though the incidence of right-sided (ascending) colon cancer is rising. * **Dietary Risk Factors:** High intake of red meat (beef, lamb), processed meat, and alcohol. * **Protective Factors:** High fiber, Calcium, Vitamin D, and regular physical activity. * **Gold Standard Screening:** Colonoscopy every 10 years, starting at age 45 (as per recent guidelines).

Q: What is the recommended duration of daily moderate exercise for an adult?

30 minutes. **Explanation:** The correct answer is **30 minutes (Option B)**. This recommendation is based on the World Health Organization (WHO) and the National Programme for Prevention and Control of Cancer, Diabetes, Cardiovascular Diseases and Stroke (NPCDCS) guidelines for physical activity in adults (18–64 years). **Why 30 minutes is correct:** To maintain cardiovascular health and reduce the risk of non-communicable diseases (NCDs) like hypertension and Type 2 Diabetes, adults are advised to engage in at least **150 minutes of moderate-intensity aerobic physical activity throughout the week**. When distributed over 5 days a week, this equates to **30 minutes per day**. Moderate-intensity exercise is defined as activity that noticeably increases heart rate and breathing (e.g., brisk walking). **Analysis of Incorrect Options:** * **Option A (15 minutes):** This duration is insufficient to meet the minimum metabolic equivalent (MET) requirements for significant chronic disease prevention. * **Option C (45 minutes):** While beneficial, this exceeds the minimum baseline recommendation for general health maintenance. * **Option D (60 minutes):** This is the specific recommendation for **children and adolescents (5–17 years)**, who require more activity for healthy growth and development. **NEET-PG High-Yield Pearls:** * **Vigorous Intensity:** If the exercise is vigorous (e.g., running), the recommendation is **75 minutes per week** (approx. 15 mins/day). * **Muscle Strengthening:** Should be done involving major muscle groups on **2 or more days** a week. * **Sedentary Behavior:** The latest guidelines emphasize "Every move counts" to offset the risks of prolonged sitting. * **Weight Loss:** For additional health benefits or weight loss, the duration should ideally be increased to 300 minutes of moderate activity per week.

Q: Reverse smoking is common in which Indian state?

Andhra Pradesh. **Explanation:** **Correct Answer: C. Andhra Pradesh** **Medical Concept & Rationale:** Reverse smoking (also known as *chutta* smoking) is a peculiar form of tobacco use where the lit end of a homemade cigar or cigarette is placed inside the mouth. This practice is culturally prevalent in the coastal districts of **Andhra Pradesh** (specifically Visakhapatnam and Srikakulam) and parts of Odisha. From a medical standpoint, reverse smoking is a high-yield topic because it is the primary risk factor for **Palatal Keratosis**. The extreme heat and combustion products directed toward the hard palate lead to a high incidence of **Carcinoma of the Hard Palate**, a site otherwise rarely affected by oral cancer in the general population. **Analysis of Incorrect Options:** * **A. Maharashtra:** While tobacco use (specifically *mishri* or smokeless tobacco) is common, reverse smoking is not a traditional practice here. * **B. Gujarat:** This state has a high prevalence of smokeless tobacco (betel quid/mava) leading to Oral Submucous Fibrosis (OSMF), but not reverse smoking. * **C. Rajasthan:** Tobacco is commonly consumed via *hookah* or *bidis* in the traditional manner, but the reverse technique is absent. **High-Yield Clinical Pearls for NEET-PG:** * **Site-Specific Cancer:** Reverse smoking is the most common cause of **Hard Palate Cancer** in India. * **Nicotina Palati:** This is the clinical term for the palatal changes (hyperpigmentation, whitening, and red dots representing inflamed salivary gland orifices) seen in these smokers. * **Demographics:** It is most commonly practiced by elderly women in rural coastal communities. * **Differential:** Do not confuse this with *Bidi* smoking (common nationwide) or *Hookli* (clay pipe smoking common in Gujarat).

Q: The WHO considers all of the following dietary modifications to be appropriate in the prevention of Coronary Heart Disease (CHD), EXCEPT:

Decrease in complex carbohydrate consumption. **Explanation:** The WHO recommendations for the prevention of Coronary Heart Disease (CHD) focus on a balanced diet that reduces atherogenic factors while maintaining protective nutrients. **Why Option A is the correct answer (The "Except"):** The WHO actually recommends an **increase** in the consumption of **complex carbohydrates** (such as whole grains, legumes, vegetables, and fruits) rather than a decrease. Complex carbohydrates are rich in dietary fiber, which helps lower LDL cholesterol and improves glycemic control. Conversely, the intake of refined carbohydrates and free sugars should be restricted to less than 10% of total energy intake. **Analysis of Incorrect Options:** * **Option B (Avoidance of alcohol):** While moderate alcohol was once thought to be cardioprotective, current WHO guidelines emphasize that there is no "safe" limit for alcohol regarding cardiovascular health, and avoidance is recommended for primary prevention. * **Option C (Reduction of dietary cholesterol):** WHO guidelines recommend limiting dietary cholesterol to **below 100 mg per 1000 kcal per day** to prevent the progression of atherosclerosis. * **Option D (Reduction of fat intake):** Total fat intake should be limited to **20-30% of total energy**. Crucially, saturated fats should be <10%, and trans-fats should be <1% of total energy. **High-Yield Clinical Pearls for NEET-PG:** * **Salt Intake:** WHO recommends restricting salt intake to **less than 5 grams per day** to prevent hypertension and CHD. * **P/S Ratio:** The recommended Polyunsaturated to Saturated fat ratio is **0.5 to 1.0**. * **Dietary Fiber:** An intake of **at least 40g/day** is recommended for cardiovascular protection. * **Prudent Diet:** A diet characterized by low saturated fat, low cholesterol, and high complex carbohydrates is termed a "Prudent Diet."

Question 1

What is the annual risk of developing breast cancer detected by mammography?

Accepted Answer

1%

Answer

0.01%

Answer

2%

Answer

2.50%

Question 2

A 45-year-old man, whose mother, father, brother, and uncle all had a history of heart disease, asks his physician about ways to reduce his risk of developing coronary artery disease. The patient is 171 cm tall, weighs 91 kg, and has a blood pressure of 125/80 mm Hg. His blood glucose concentration is 181 mg/dL. Which of the following is the best dietary advice to give this patient?

Accepted Answer

Reduce intake of saturated fat

Answer

Avoid adding salt to food

Answer

Drink more water

Answer

Increase dietary fiber

Question 3

High incidence of oral malignancies is attributed to which of the following factors?

Accepted Answer

Use of pan

Answer

Poor hygiene

Answer

High incidence of HPV

Answer

Poor nutrition

Question 4

Which of the following cancers have shown to be reduced by chemoprevention trials?

Accepted Answer

Breast Cancer and Cancers of the aero-digestive tract

Answer

Lymphoma and Breast Cancer

Answer

Lymphoma, Breast Cancer, and Cancers of the aero-digestive tract

Answer

Lymphoma, Pancreatic Cancer, and Cancers of the urinary bladder

Question 5

Which of the following is the best indicator of cardiovascular disease risk?

Accepted Answer

Waist to hip ratio

Answer

Skin fold thickness

Answer

Waist circumference

Answer

Body Mass Index (BMI)

Question 6

Based on epidemiological studies, which of the following has been found to be most protective against colon cancer?

Accepted Answer

High fiber diet

Answer

Low fat diet

Answer

Low selenium diet

Answer

Low protein diet

Question 7

What is the recommended duration of daily moderate exercise for an adult?

Accepted Answer

30 minutes

Answer

15 minutes

Answer

45 minutes

Answer

60 minutes

Question 8

Reverse smoking is common in which Indian state?

Accepted Answer

Andhra Pradesh

Answer

Maharashtra

Answer

Gujarat

Answer

Rajasthan

Question 9

According to epidemiological studies, which dietary factor has been found to be most protective against carcinoma of the colon?

Accepted Answer

High fiber diet

Answer

Low fat diet

Answer

Low selenium diet

Answer

Low protein diet

Question 10

The WHO considers all of the following dietary modifications to be appropriate in the prevention of Coronary Heart Disease (CHD), EXCEPT:

Accepted Answer

Decrease in complex carbohydrate consumption

Answer

Avoidance of alcohol consumption

Answer

Reduction of dietary cholesterol to below 100 mg per 1000 kcal per day

Answer

Reduction of fat intake to 20-30 percent of total energy intake

Non-Communicable Diseases — MCQs

Non-Communicable Diseases — MCQs

On this page

Practice by Chapter

Want unlimited practice?