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: Medicine
[{'content': 'Which hepatitis virus has worst prognosis in pregnancy : \nSelect and explain. \nA. HBV, B. HCV, C. HEV, D. HAV', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Answer is C (HEV)', 'role': 'assistant'}]