This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
[{'content': 'A 32 year old person comes to the hospital after 2 weeks of the onset of diarrhoea. Diagnosis of typhoid can be confirmed with \nSelect and explain. \nA. Urine culture, B. Stool culture, C. Blood culture, D. Widal test', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Diagnosis done in\n\n1st week - Blood culture\n2nd week - Widal / Antibodies level\n2rd week - Stool culture\n4th week - Urine culture', 'role': 'assistant'}]