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': 'True about typhoid-a) It is caused by food poisoningb) Water can transmit the diseasec) Ty21a is an oral vaccined) Chronic carrier is called when transmitted upto 6 monthe) Widal test +ve in 1st week \nSelect and explain. \nA. a, B. c, C. ac, D. bc', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]