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': 'Which is not a feature of pilonidal sinus? \nSelect and explain. \nA. Common is young males, B. Abscess formation, C. Jack knife position is used for surgery, D. Recurrance is not common', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Recurrance is common in pilonodal sinus.', 'role': 'assistant'}]