This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Contraception, Subject name: Gynaecology & Obstetrics
Which of the following oral contraceptive pills have the least amount of estrogen? 
Select and explain. 
A. Mala N, B. Triquilar, C. Femilon, D. Novelon
C: Femilon
Answer: C: Femilon 
Explanation: newer oral pill (Femilon) contains 20 mcg EE2. Reference: Shaw's Textbook of Gynaecology 16th edition page no 274