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': 'The treatment of a patient with myocardial infarction is thrombolytic therapy, if the patient presents within ---- hours of Chest pain - \nSelect and explain. \nA. 6 hours, B. 12 hours, C. 18 hours, D. 24 hours', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]