This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Testis and scrotum, Subject name: Surgery
[{'content': 'In cryptorchidism, hallmark histological changes appear in testis at: \nSelect and explain. \nA. 4 months, B. 6 months, C. 8 months, D. 1 year', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Histopathology- Abnormal germ cell histology- 1-2 Years:* Earliest change - Hypoplasia of Leydig cells (1 month of age)- Degeneration of Seoli Cells- Delayed disappearance of gonocytes- Delayed appearance of adult dark spermatogonia', 'role': 'assistant'}]