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
58 years old male presenting with acute onset of varicocle on left side most prbobable cause - 
Select and explain. 
A. Ca testes, B. Epididymitis, C. Inguinal lymphnodes, D. Ca kidney
D: Ca kidney
Answer: D: Ca kidney 
Explanation: None