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
[{'content': 'Clomiphene citrate is: \nSelect and explain. \nA. Antiandrogen, B. Synthetic steroid, C. Antiestrogen, D. GnRH analogue', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]