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': 'An operated case of varicose veins has a recurrence rate of - \nSelect and explain. \nA. About 10%, B. About 25%, C. About 50%, D. Over 60%', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]