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: Physiology
Contraceptive action of combined pill is mainly due to: 
Select and explain. 
A. Decrease in tubal motility, B. Prevents the fertilization, C. Prevents the implantation of fertilized egg, D. Inhibits ovulation
D: Inhibits ovulation
Answer: D: Inhibits ovulation 
Explanation: None