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
Mestranol acts as a contraceptive by : 
Select and explain. 
A. Inhibiting FSH secretion, B. Inhibiting LH secretion, C. Inhibiting tubal motility, D. Inhibiting nidation
A: Inhibiting FSH secretion
Answer: A: Inhibiting FSH secretion 
Explanation: Inhibiting FSH secretion