UPSC Prelims 2015— Question 92

Correct answer: Option D. H1N1 is a subtype of influenza A virus. The 2009 H1N1 pandemic was popularly associated with ‘swine flu’, although the virus was a reassortant influenza virus and human transmission became the dominant public-health concern. It is not the virus responsible for AIDS, dengue or avian influenza. Option-wise analysis: Option A: “AIDS” is incorrect. It does not match the specific fact, definition, institutional role, geographical association, or constitutional/economic principle required here. The key distinction is the one identified in the core explanation, so this option can be eliminated. Option B: “Bird flu” is incorrect. It does not match the specific fact, definition, institutional role, geographical association, or constitutional/economic principle required here. The key distinction is the one identified in the core explanation, so this option can be eliminated. Option C: “Dengue” is incorrect. It does not match the specific fact, definition, institutional role, geographical association, or constitutional/economic principle required here. The key distinction is the one identified in the core explanation, so this option can be eliminated. Option D: “Swine flu” is correct. It directly matches the factual or conceptual requirement tested by the question and is supported by the principle explained above. Prelims takeaway: Focus on the precise institutional role, constitutional provision, geographical association, or technical definition being tested. UPSC questions often place a broadly familiar fact beside a narrowly incorrect qualifier; identifying that qualifier is essential for elimination.