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': 'Not true about Vi polysaccharide vaccine of typhoid: \nSelect and explain. \nA. Single dose is given, B. Revaccination at 3 years, C. Given at bih, D. Given subcutaneously', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is. 'c' i. e., Given at bih", 'role': 'assistant'}]