This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Drugs, 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: Ans. is 4b' i.e., 6 minutes o Alteplase has a plasma half-life of 4-6 minutes.", 'role': 'assistant'}]