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': "Poor prognostic factor in Acute Myocardial .infarction- \nSelect and explain. \nA. VPC's in first 24 hours, B. Hypotension at diagnosis, C. Chest pain, D. Hypertension", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]