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': 'Carrier state does not exist for ? \nSelect and explain. \nA. Hepatitis B virus, B. Hepatitis A virus, C. Non A Non B Hepatitis, D. Delta agent', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is `b' i.e., Hepatitis A virus", 'role': 'assistant'}]