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: Pharmacology
The combined estrogen-progestin pill act mainly by: 
Select and explain. 
A. Production of cervical MUCUS penetration, B. Suppression of FSH and LH release, C. Making endometrium unsuitable for implantation, D. Enhancing uterine contraction to dislodge the fertilized ovum
B: Suppression of FSH and LH release
Answer: B: Suppression of FSH and LH release 
Explanation: None