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
Pearl index of 0 can be seen in which method of contraception 
Select and explain. 
A. Male condom, B. Rythm method, C. Coitus interruptus, D. Abstinence
D: Abstinence
Answer: D: Abstinence 
Explanation: None