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: Microbiology
[{'content': 'Carriers of Salmonella typhi can be detected by ? \nSelect and explain. \nA. Widal test, B. Blood culture, C. Sputum culture, D. Culture of feces', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Culture of feces . Identification of fecal carriers is by isolation of the bacillus from feces or from bile. . Identification of urinary carriers is by isolation of the bacillus from urine.", 'role': 'assistant'}]