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
In cryptorchidism, hallmark histological changes appear in testis at: 
Select and explain. 
A. 4 months, B. 6 months, C. 8 months, D. 1 year
D: 1 year
Answer: D: 1 year 
Explanation: 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