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
Mestranol acts as contraceptic by 
Select and explain. 
A. Inhibiting FSH secretion, B. Inhibiting tubal motility, C. Inhibiting ascent of sperm, D. Inhibiting Implantation
A: Inhibiting FSH secretion
Answer: A: Inhibiting FSH secretion 
Explanation: None