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': 'In cryptorchism histological changes appear in testis \nSelect and explain. \nA. 4 months, B. 6 months, C. 8 months, D. 1 year', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Answer- B. 6 months', 'role': 'assistant'}]