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: Surgery
[{'content': 'What is safe maximum time for storage of heart? \nSelect and explain. \nA. 2 hours, B. 4 hours, C. 6 hours, D. 8 hours', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Heart should be ideally transplanted within 3 hours. Max peroid is 6 hours.', 'role': 'assistant'}]