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
Billing method of contraception is synonymous for ? 
Select and explain. 
A. Rhythm method, B. Basal body temperature method, C. Cervical mucus method, D. Abstinence
C: Cervical mucus method
Answer: C: Cervical mucus method 
Explanation: Ans. is 'c' i.e., Cervical mucus method