This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Testis & Scrotum, Subject name: Surgery
Which of the following predisposes to testicular germ cell tumors? 
Select and explain. 
A. Kleinfelter syndrome, B. Testicular carcinoma in sibling, C. Cryptorchidism, D. All the above
D: All the above
Answer: D: All the above 
Explanation: Ans. is 'd' i.e., All the above * Predisposing factors for testicular Germ Cell Tumors are:a) Cryptorchidismb) Testicular feminization syndromec) GCT of one testis is a risk factor for the other testisd) Testicular Ca in a siblinge) Klienfelter syndrome - is associated with mediastinal GCTf) Administration of estrogens (eg DES) to the mother during pregnancy is associated with increased incidence of testicular Ca in male offspring.