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: Unknown
Oral combined contraceptive pills contain which one of the following sets of hormones? 
Select and explain. 
A. Ethinyl estradiol, progestogen, and estrone, B. Progestogen and ethinyl estradiol, C. Progestogen and estrone, D. Estrone and ethinyl estradiol
B: Progestogen and ethinyl estradiol
Answer: B: Progestogen and ethinyl estradiol 
Explanation: None