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B
Pneumonia
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C
Malaria
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D
Filaria
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Solution
The correct option is D Typhoid Widal test is a serological test used to detect typhoid and paratyphoid fever by agglutination technique in which the antigens of the bacterium react with the antibodies in the sample from the patient. The antigens of the bacterium species Salmonella typhi and paratyphi are detected.