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
[{'content': 'All are true regarding selective estrogen receptor down (SERD) Fulvestrant exept \nSelect and explain. \nA. Used for treatment of advanced breast cancer, B. Is a selective estrogen antagonist, C. Is slower, sho acting and less safer than SERMS, D. Administered as once month i.m. dose', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Fulvestrant is more efficient than tamoxifen,used in the treatment of metastatic ER positive breast cancer. It is a selective estrogen antagonist and is administered as 250mg monthly i.m Injections. (Ref.Essentials of medical pharmacology TD Tripathi 7th edition page no 313)', 'role': 'assistant'}]