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': 'Heaptitis A true is \nSelect and explain. \nA. 3% incidence of carrier state, B. Causes mild illness in children, C. Sexual route common, D. 10% transform into HCC', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]