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
[{'content': 'Tamoxifene ? \nSelect and explain. \nA. SSRI, B. SERM, C. SNRI, D. DNRI', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is `b' i.e., SERM Tamoxifen is a selective estrogen receptor modulator (SERM).", 'role': 'assistant'}]