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: Social & Preventive Medicine
All are reversible method of contraception, except 
Select and explain. 
A. OCP, B. Vasectomy, C. IUCD, D. Depot injection
B: Vasectomy
Answer: B: Vasectomy 
Explanation: None