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: Pharmacology
[{'content': 'Alteplase differs from streptokinase as it : \nSelect and explain. \nA. Is longer acting, B. Is derived from human kidney, C. Is cheap, D. Activates plasminogen bound to fibrin', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]