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
[{'content': 'Pearl index of 0 can be seen in which method of contraception \nSelect and explain. \nA. Male condom, B. Rythm method, C. Coitus interruptus, D. Abstinence', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]