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: Pharmacology
Major estrogen in normal adult women is - 
Select and explain. 
A. Estradiol, B. Estrone, C. Estriol, D. None of the above
A: Estradiol
Answer: A: Estradiol 
Explanation: Ans. is 'a' i.e., Estradiol o Estradiol is the major estrogen secreted by the ovary.