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
All are used in the treatment of hot flushes except: 
Select and explain. 
A. Tamoxifen, B. Venlafaxine, C. Gabapentin, D. Clonidine
A: Tamoxifen
Answer: A: Tamoxifen 
Explanation: None