This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Osteoporosis, Sex Hormones and OCPs, Subject name: Pharmacology
[{'content': 'The combined estrogen-progestin oral contraceptive pill act mainly by: \nSelect and explain. \nA. Production of cervical mucus hostile to sperm penetration, B. Making endometrium unsuitable for implantation, C. Suppression of FSH and LH release, D. Enhancing uterine contraction to dislodge the feilized ovum', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Oral Contraceptives: OCP Mechanism Combined OCP(E + P) Inhibition of ovulation Progesterone Cervical mucus thick and hostile Emergency/Post coital/Morning after pills Dislodging of implantation', 'role': 'assistant'}]