This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urethra & Penis, Subject name: Surgery
During a workup for infertility, a 34-year-old man is noted to have a solid tumor in the anterior aspect of his right testis. What is the most likely diagnosis? 
Select and explain. 
A. Torsion of the testis, B. Cyst of the epididymis, C. Lipoma of the cord, D. Cancer of the testis
D: Cancer of the testis
Answer: D: Cancer of the testis 
Explanation: Non-hematogenous testicular tumors are divided into two categories - germ cell tumors (seminoma, non-seminoma, i.e., embryonal, choriocarcinoma, teratoma, teratocarcinoma, yolk sac tumors) and non-germ cell tumors (Leydig cell or Sertoli cell). There is no mass within the testis with torsion. Epididymitis presents within painful tender testis.