This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hepatitis, Subject name: Medicine
[{'content': 'Most common viral cause of Fulminant hepatic failure in pregnancy? \nSelect and explain. \nA. HAV, B. HBV, C. HCV, D. HEV', 'role': 'user'}, {'content': 'Answer: D \nExplanation: HEV- increases risk of fulminant hepatic failure in pregnancy', 'role': 'assistant'}]