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
A testicular tumor in a man aged 60 years is; most likely to be - 
Select and explain. 
A. Germ cell tumor, B. Sertoli cell tumor, C. Teratocarcinoma, D. Lymphoma
D: Lymphoma
Answer: D: Lymphoma 
Explanation: "Lymphoma is the most common testicular tumor in a patient over the age of 50 and is the most common secondary neoplasm of the testis" - Smith's Urology