This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Medicine
[{'content': 'Half life of alteplase \nSelect and explain. \nA. 3 min, B. 6 min, C. 9 min, D. 12 min', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ref Harrison 19 th ed pg 758 Atleplase has a plasma half-life of 4-6 minutes.', 'role': 'assistant'}]