This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sex-Hormone, Subject name: Pharmacology
Which of the following is a synthetic estrogen ? 
Select and explain. 
A. Estrone, B. Estriol, C. Estradiol, D. Diethylstibestrol
D: Diethylstibestrol
Answer: D: Diethylstibestrol 
Explanation: Ans. is 'd' i.e., DiethylstibestrolEstrogeno Ethinylestradiolo Diethylstibestrolo Mestranolo Hexestrolo Tiboloneo Dienestroi