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
Tamoxifene ? 
Select and explain. 
A. SSRI, B. SERM, C. SNRI, D. DNRI
B: SERM
Answer: B: SERM 
Explanation: Ans. is `b' i.e., SERM Tamoxifen is a selective estrogen receptor modulator (SERM).