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: Gynaecology & Obstetrics
All of the following are features of progesterone pills except : 
Select and explain. 
A. Acts by altering cervical mucous secretion, B. Break ovulation cycle, C. Failure rate is equal to that seen with OCP's, D. Irregular bleeding is a known complications
C: Failure rate is equal to that seen with OCP's
Answer: C: Failure rate is equal to that seen with OCP's 
Explanation: Failure rate is equal to that seen with OCP's