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': 'Ossification centre of scaphoid appears at \nSelect and explain. \nA. 1-6 months, B. 1 to 2 years, C. 2 to 4 years, D. 4 to 6 years', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Answer- D. 4 to 6 years', 'role': 'assistant'}]