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
[{'content': 'Which of the following is a synthetic estrogen ? \nSelect and explain. \nA. Estrone, B. Estriol, C. Estradiol, D. Diethylstibestrol', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., DiethylstibestrolEstrogeno Ethinylestradiolo Diethylstibestrolo Mestranolo Hexestrolo Tiboloneo Dienestroi", 'role': 'assistant'}]