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': 'Reactionary hemorrhage occurs within - \nSelect and explain. \nA. 1-2 days, B. 2-7 days, C. <24 hours, D. After 7 days', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]