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
Clomiphene is - 
Select and explain. 
A. Antiprogestin, B. Antiestrogen, C. Antiandrogen, D. Antidiabetecs
B: Antiestrogen
Answer: B: Antiestrogen 
Explanation: Ans. is 'b' i.e., Antiestrogen o It acts as a pure estrogen antagonist in all human tissues.