This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Osteoporosis, Sex Hormones and OCPs, Subject name: Pharmacology
[{'content': 'Long term adverse effect of tamoxifen is \nSelect and explain. \nA. Weight gain, B. Osteoporosis, C. Venous thrombosis, D. Breast cancer', 'role': 'user'}, {'content': 'Answer: C \nExplanation: TAMOXIFEN - It is SERM - Actions Bone - | formation of bone; decrease risk of osteoporosis Blood - | HDL Breast -Decrease risk of breast cancer Liver - | clotting factor leading to thromboembolism Endometrium - | risk of endometrial cancer', 'role': 'assistant'}]