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
Which of the following is true about varicocele except? 
Select and explain. 
A. Incompetent valves of testicular vein are responsible for varicocele, B. 90% are on the left side, C. Asymptomatic cases require surgery, D. Femoral catheterization with spermatic vein ablation is done in recurrence
C: Asymptomatic cases require surgery
Answer: C: Asymptomatic cases require surgery 
Explanation: None