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Widal test is used in the diagnosis of:

ATyphoid
BAIDS
CCancer
DMalaria
Answer & Solution
Correct answer: A. Typhoid
**Widal test** = serological test that detects antibodies against Salmonella antigens → diagnoses **typhoid**. (ELISA is used for AIDS; biopsy/MRI for cancer; blood smear for malaria.)
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