This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Pharmacology
Treatment for male pattern alopecia includes 
Select and explain. 
A. Finasteride, B. Potassium channel blocker, C. Fulvestrant, D. Dexamethasone
A: Finasteride
Answer: A: Finasteride 
Explanation: Finasteride and dutasteride are 5 alpha reductase inhibitors; inhibit the formation of Dihydrotestosterone. So they are used in alopecia and also in BPH. Minoxidil also used in treatment. Fulvestrant is a SERD selective estrogen down regulator Ref: KD tripathi , 8th ed