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: Gynaecology & Obstetrics
Ferning pattern of mucus under influence of: March 2013 
Select and explain. 
A. Progesterone, B. Testosterone, C. Estrogen, D. Prostaglandins
C: Estrogen
Answer: C: Estrogen 
Explanation: Ans. C i.e. Estrogen