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': 'The following statement about Pilonidal Sinus is true : \nSelect and explain. \nA. More common in females, B. Mostly congenital, C. Prognosis after surgery is poor, D. Treatment of choice is sugrical excision of sinus tract', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]