Occupational Diseases — MCQs
Which of the following is NOT a core component of the WHO's global STI control strategy?
Maximum predisposition to tuberculosis is seen in which pneumoconiosis?
A factory of 30 persons has monthly wage bill of Rs 30,000. According to ESI Act, what amount will the employer pay as ESI contribution every month?
Which of the following poisonings presents with abdominal pain, diarrhea, Mees lines on nails, and myelosuppression?
Occupational cancer involves the following organs, except:
A patient presents with generalized and easy fatigability. He reports weakness while working in a factory with exposure to benzene. Which of the following conditions should be suspected in this patient?
Mees' lines and raindrop pigmentation on the hands are seen in which type of poisoning?
Match the following: A) Caplan syndrome- 1) Found first in coal worker B) Asbestosis- 2) Upper lobe predominance C) Mesothelioma- 3) Involves lower lobe D) Sarcoidosis- 4) Pleural effusion is seen
Which of the following is an occupational lung disease but not a pneumoconiosis?
Caisson's disease is primarily associated with which of the following?
Occupational Diseases Indian Medical PG Practice Questions and MCQs
Question 1: Which of the following is NOT a core component of the WHO's global STI control strategy?
- A. Case management
- B. Universal mandatory screening (Correct Answer)
- C. Strategic information systems
- D. Prevention services
Explanation: ***Universal mandatory screening*** - While screening is part of STI control, **universal mandatory screening** for all STIs in the general population is not a core component of the WHO's strategy due to feasibility, cost, and ethical considerations. - The strategy emphasizes **targeted screening** for at-risk populations and opportunistic screening. *Case management* - **Case management**, including accurate diagnosis and effective treatment, is a critical component for managing current infections and preventing further transmission. - This involves syndromic or etiologic approaches to treatment and partner notification. *Strategic information systems* - **Strategic information systems** are essential for monitoring trends, evaluating interventions, and informing policy decisions related to STI control. - This includes surveillance data, program monitoring, and research. *Prevention services* - **Prevention services** are a cornerstone of the WHO's strategy, aiming to reduce the incidence of new infections. - These services encompass health education, condom promotion and distribution, vaccination, and pre-exposure prophylaxis (PrEP).
Question 2: Maximum predisposition to tuberculosis is seen in which pneumoconiosis?
- A. Anthracosis
- B. Byssinosis
- C. Silicosis (Correct Answer)
- D. Bagassosis
Explanation: ***Silicosis*** - **Silicosis** is particularly associated with an increased risk of developing **tuberculosis** due to the impairment of alveolar macrophage function [1]. - Silica particles interfere with the ability of macrophages to destroy *Mycobacterium tuberculosis*, leading to a higher susceptibility to infection and reactivation of latent tuberculosis [1]. - This classic association is known as **silicotuberculosis**. *Anthracosis* - **Anthracosis** (coal worker's pneumoconiosis) is caused by inhaling coal dust and, while it can impair lung function, it has a weaker association with tuberculosis compared to silicosis [2]. - The carbon particles in anthracosis are relatively inert and typically do not induce the same level of macrophage dysfunction as silica. *Byssinosis* - **Byssinosis** is an occupational lung disease caused by exposure to cotton, flax, or hemp dust, often presenting with chest tightness towards the beginning of the work week. - It is not specifically predisposed to tuberculosis, as it involves an inflammatory response to organic dusts rather than crystalline silica. *Bagassosis* - **Bagassosis** is a hypersensitivity pneumonitis resulting from exposure to *Thermophilic actinomycetes* found in moldy sugarcane (bagasse) [2]. - This condition is an allergic reaction in the lungs and does not have a significant association with an increased risk of tuberculosis. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, pp. 697-698. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, p. 695.
Question 3: A factory of 30 persons has monthly wage bill of Rs 30,000. According to ESI Act, what amount will the employer pay as ESI contribution every month?
- A. 5000 Rs
- B. 2000 Rs
- C. 1425 Rs
- D. 975 Rs (Correct Answer)
Explanation: ***975 Rs*** - As per the **Employees' State Insurance (ESI) Act** (current rates effective from July 2019), the employer's contribution rate is **3.25% of the total wages** paid. - For a monthly wage bill of Rs 30,000, the employer's ESI contribution would be 3.25% of 30,000 = **Rs 975**. - The total ESI contribution (employer + employee) is **4.00%**, with employer paying 3.25% and employee paying 0.75%. *1425 Rs* - This value was based on the **old employer contribution rate of 4.75%** (before July 2019). - The current rate is **3.25%**, making this amount incorrect under the present ESI Act provisions. *5000 Rs* - This value is significantly higher than the statutory employer contribution rate under the **ESI Act**. - It represents approximately **16.67%** of wages, which is far above the actual rate. *2000 Rs* - This amount exceeds the standard **3.25% employer contribution** specified by the ESI Act. - It represents approximately **6.67%** of the monthly wage bill, which does not align with current statutory rates.
Question 4: Which of the following poisonings presents with abdominal pain, diarrhea, Mees lines on nails, and myelosuppression?
- A. Lead
- B. Arsenic (Correct Answer)
- C. Alcohol
- D. Mercury
Explanation: ***Arsenic*** - **Arsenic poisoning** is characterized by gastrointestinal symptoms like severe **abdominal pain** and **diarrhea**, as well as dermatological signs such as **Mees lines** (transverse white bands on fingernails). - It also causes **myelosuppression**, leading to anemia, leukopenia, and thrombocytopenia, and can affect the cardiovascular and nervous systems. *Lead* - **Lead poisoning** typically presents with diffuse **abdominal pain** (lead colic), **constipation** (not diarrhea), and neurological symptoms like **foot drop** and **encephalopathy**. - While it can cause anemia due to impaired heme synthesis, **Mees lines** and significant myelosuppression are not primary features. *Alcohol* - **Alcohol intoxication** or chronic alcoholism primarily affects the central nervous system, liver, and pancreas, leading to symptoms like **ataxia**, **hepatitis**, and **pancreatitis**. - It does not cause **Mees lines** or the specific combination of severe gastrointestinal issues and myelosuppression seen with arsenic. *Mercury* - **Mercury poisoning** typically manifests with neurological symptoms (tremors, emotional lability, **peripheral neuropathy**), stomatitis, and renal dysfunction. - While it can cause gastrointestinal upset, **Mees lines** and **myelosuppression** are not characteristic features of mercury toxicity.
Question 5: Occupational cancer involves the following organs, except:
- A. Bladder
- B. Liver
- C. Breast (Correct Answer)
- D. Lung
Explanation: ***Breast*** - While breast cancer is a significant health concern, it is not consistently recognized as a primary site for **occupational cancer** directly linked to specific workplace exposures. - The major risk factors for breast cancer are typically **hormonal**, **genetic**, and related to **lifestyle**, rather than occupational carcinogens. *Lung* - The **lung** is a well-established site for occupational cancer, commonly associated with exposure to carcinogens like **asbestos**, **radon**, **silica**, and **polycyclic aromatic hydrocarbons (PAHs)**. - Industries such as mining, construction, and manufacturing have a higher risk of lung cancer due to inhaled occupational hazards. *Bladder* - The **bladder** is a recognized site for occupational cancer, particularly for workers exposed to **aromatic amines** and **benzidine-based dyes**. - Occupations in the chemical, rubber, and dye industries have historically shown increased rates of bladder cancer. *Liver* - The **liver** can be affected by occupational carcinogens such as **vinyl chloride** (leading to angiosarcoma of the liver) and **arsenic**. - Workers in plastics manufacturing and those exposed to certain industrial chemicals are at higher risk for liver cancers.
Question 6: A patient presents with generalized and easy fatigability. He reports weakness while working in a factory with exposure to benzene. Which of the following conditions should be suspected in this patient?
- A. Hepatocellular Carcinoma
- B. Leukemia (Correct Answer)
- C. Carcinoma Gall Bladder
- D. Urinary Bladder Cancer
- E. Aplastic Anemia
Explanation: ***Leukemia*** - **Benzene exposure** is a well-established risk factor for developing **leukemia**, particularly acute myeloid leukemia (AML) and myelodysplastic syndromes (MDS). - **Generalized fatigue** and **easy fatigability** are common symptoms of leukemia, resulting from anemia, bone marrow infiltration, and systemic effects of the disease. - Benzene is classified as a **Group 1 carcinogen** by IARC with strong evidence for leukemogenesis. *Aplastic Anemia* - While benzene exposure can cause **aplastic anemia** (bone marrow failure), this condition typically presents with **pancytopenia** and more severe symptoms including bleeding and infections. - However, given the occupational exposure and symptoms, **leukemia** remains the primary concern as it is more commonly associated with chronic benzene exposure. - Aplastic anemia from benzene is less common than benzene-induced leukemia. *Hepatocellular Carcinoma* - While benzene exposure can be **hepatotoxic**, it is not primarily associated with an increased risk of **Hepatocellular Carcinoma**. - Risk factors for hepatocellular carcinoma include **chronic viral hepatitis** (HBV, HCV) and **alcoholism**. *Carcinoma Gall Bladder* - There is **no significant association** between benzene exposure and the development of **gallbladder cancer**. - Risk factors for gallbladder cancer include **gallstones**, porcelain gallbladder, and chronic inflammation. *Urinary Bladder Cancer* - **Aromatic amines** and **anilines** (often found in dye, rubber, and chemical industries) are established causes of bladder cancer, not typically benzene itself. - While benzene is a carcinogen, **bladder cancer** is not considered a primary or strong association with its exposure.
Question 7: Mees' lines and raindrop pigmentation on the hands are seen in which type of poisoning?
- A. Arsenic (Correct Answer)
- B. Thallium
- C. Cadmium
- D. Lead
Explanation: **Arsenic** - **Mees' lines** (transverse white bands on fingernails) and **raindrop pigmentation** (hyperpigmentation with scattered hypopigmented spots) are classic dermatological manifestations of chronic arsenic poisoning. - Arsenic interferes with cellular respiration and DNA repair, leading to systemic effects including characteristic skin changes. *Thallium* - Thallium poisoning is often associated with diffuse **hair loss (alopecia)**, sensory neuropathy, and gastrointestinal symptoms. - It does not typically cause Mees' lines or raindrop pigmentation. *Cadmium* - Chronic cadmium exposure is primarily associated with **renal dysfunction** (Fanconi syndrome), **osteomalacia**, and lung disease. - It does not cause the specific nail or skin pigmentation described. *Lead* - Lead poisoning typically manifests with **gastrointestinal symptoms** (colic), neurological deficits (foot drop), and **anemia**. - While it can cause some dermatological changes, **Mees' lines** and **raindrop pigmentation** are not characteristic features.
Question 8: Match the following: A) Caplan syndrome- 1) Found first in coal worker B) Asbestosis- 2) Upper lobe predominance C) Mesothelioma- 3) Involves lower lobe D) Sarcoidosis- 4) Pleural effusion is seen
- A. A-3, B-4, C-2, D-1
- B. A-1, B-4, C-3, D-2 (Correct Answer)
- C. A-4, B-2, C-3, D-1
- D. A-2, B-4, C-3, D-1
Explanation: **A-1, B-4, C-3, D-2** - **Caplan syndrome** was first described in **coal workers** with **rheumatoid arthritis** and progressive massive fibrosis. - **Asbestosis** is often associated with **pleural effusion**, which can be benign or malignant. - **Mesothelioma** typically involves the **lower lobes** of the lungs, specifically the pleura, and is strongly linked to asbestos exposure. - **Sarcoidosis** is characterized by **non-caseating granulomas**, which have a predilection for the **upper lobes** of the lungs. *A-3, B-4, C-2, D-1* - This option incorrectly states that Caplan syndrome involves the lower lobe; **Caplan syndrome** is defined by the presence of large nodules in the lungs of coal workers with rheumatoid arthritis, and their specific lobar distribution is not a defining characteristic. - This option incorrectly states that Mesothelioma has an upper lobe predominance; **Mesothelioma** is a pleural malignancy and typically involves the **lower lobes**, extending along the pleura. *A-4, B-2, C-3, D-1* - This option incorrectly associates Caplan syndrome with pleural effusion; **Caplan syndrome** manifests as rheumatoid nodules in the lungs, not primarily pleural effusion. - This option incorrectly states that Asbestosis has an upper lobe predominance; **Asbestosis** predominantly affects the **lower lobes** of the lungs, causing interstitial fibrosis. *A-2, B-4, C-3, D-1* - This option incorrectly states that Caplan syndrome has an upper lobe predominance; the defining feature of **Caplan syndrome** is the combination of rheumatoid arthritis and pneumoconiosis, not specific lobar involvement. - This option correctly identifies pleural effusion with asbestosis and lower lobe involvement with mesothelioma, but **Caplan syndrome** is not characterized by upper lobe predominance.
Question 9: Which of the following is an occupational lung disease but not a pneumoconiosis?
- A. Silicosis
- B. Brucellosis
- C. Anthracosis
- D. Byssinosis (Correct Answer)
Explanation: ***Byssinosis*** - This is an **occupational lung disease** seen in textile workers exposed to cotton, flax, or hemp dust, but it is **NOT a true pneumoconiosis**. - Unlike pneumoconioses which involve **irreversible fibrosis** from inorganic dust accumulation, byssinosis causes **reversible airway obstruction** and bronchospasm. - It presents with characteristic **chest tightness and dyspnea** that worsen on the **first day back at work** (Monday morning syndrome) and improve over the work week. - The pathophysiology involves **endotoxin-mediated bronchoconstriction**, not dust deposition leading to fibrosis. *Silicosis* - This is a classic **pneumoconiosis** caused by inhalation of **crystalline silica dust** in occupations like mining, sandblasting, and stone cutting. - It leads to **nodular fibrosis** and progressive lung damage from inorganic dust accumulation. *Anthracosis* - This is a **pneumoconiosis** resulting from inhalation of **coal dust**, commonly seen in coal miners. - It involves accumulation of carbon particles leading to pulmonary fibrosis (coal worker's pneumoconiosis). *Brucellosis* - While this is an **occupational infection** (veterinarians, farm workers, slaughterhouse workers), it is **not primarily a lung disease**. - It is a **systemic bacterial infection** caused by *Brucella* species affecting the reticuloendothelial system. - Main symptoms include undulant fever, sweats, arthralgia, and hepatosplenomegaly, not pulmonary manifestations.
Question 10: Caisson's disease is primarily associated with which of the following?
- A. None of the options
- B. Underwater construction workers (Correct Answer)
- C. Rapid ascent in aircraft
- D. Rapid ascent of deep sea divers
Explanation: ***Underwater construction workers*** - Caisson's disease, also known as **decompression sickness (DCS)**, is historically linked to workers in **caissons**, which are watertight structures used for underwater construction. - These workers experience changes in pressure that can lead to nitrogen bubbles forming in their tissues upon surfacing, causing the characteristic symptoms of DCS. *Rapid ascent in aircraft* - While rapid ascent in aircraft can cause **decompression sickness**, especially in unpressurized cabins, it is not the primary association for the historical term "Caisson's disease." - The term "Caisson's disease" specifically refers to the condition in workers exposed to **high atmospheric pressure** during underwater construction. *None of the options* - This option is incorrect because **underwater construction workers** are directly associated with Caisson's disease. - The question has a correct and specific answer. *Rapid ascent of deep sea divers* - **Deep-sea divers** are susceptible to decompression sickness due to rapid ascent, which is physiologically similar to Caisson's disease. - However, the specific term "Caisson's disease" most directly refers to the historical experience of **underwater construction workers** in caissons.
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