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': 'Billing method of contraception is synonymous for ? \nSelect and explain. \nA. Rhythm method, B. Basal body temperature method, C. Cervical mucus method, D. Abstinence', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Cervical mucus method", 'role': 'assistant'}]