This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Virology, Subject name: Microbiology
[{'content': 'Potent vaccine is available for - \nSelect and explain. \nA. Hepatitis C, B. Hepatitis A, C. Hepatitis D, D. Hepatitis E', 'role': 'user'}, {'content': 'Answer: B \nExplanation: A safe and effective formalin inactivated alum conjugated vaccine available for HAV . Which is lasts for10-20 yr REF:ANANTHANARYANAN TEXT BOOK OF MICROBIOLOGY 9EDITION PGNO.542', 'role': 'assistant'}]