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The Widal test is used to diagnose which disease?
A{'text': 'Typhoid', 'label': 'A'}
B{'text': 'Malaria', 'label': 'B'}
C{'text': 'Common cold', 'label': 'C'}
D{'text': 'AIDS', 'label': 'D'}
Answer & Solution
Correct answer: A. {'text': 'Typhoid', 'label': 'A'}
1. The Widal test detects antibodies against Salmonella antigens.
2. Positive Widal indicates typhoid infection.
3. NCERT mentions the historic case of Mary Mallon ("Typhoid Mary"), a chronic carrier.
4. Malaria diagnosis relies on blood smear microscopy; AIDS on antibody testing.
_Source: NCERT Class 12 Biology, Ch 7 "Human Health and Disease", §7.1_
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