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: Pathology
[{'content': 'After extraction radiotherapy should be avoided for: \nSelect and explain. \nA. 7days., B. 10-14days., C. 15-20days., D. 30 days.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]