input: The following are multiple choice questions (with answers) about medical knowledge.   **Question:** In a patient with typhoid, diagnosis after 15 days of onset of fever is best done by:   (A) Blood culture   (B) Widal test   (C) Stool culture   (D) Urine culture
output: ['(C) Stool culture <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Blood culture  (B) Widal test  (C) Stool culture  (D) Urine culture <> possible answers', '  In a patient with typhoid, diagnosis after 15 days of onset of fever is best done by: <> context']