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': 'Only Hepatitis virus which can be cultured is: \nSelect and explain. \nA. HAV, B. HBV, C. HDV, D. HCV', 'role': 'user'}, {'content': 'Answer: A \nExplanation: HAV', 'role': 'assistant'}]