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 true regarding selective estrogen receptor down–regulator (SERD), Fulvestrant except: 
Select and explain. 
A. Used for treatment of advanced breast cancer, B. Is a selective estrogen antagonist, C. Is slower and short acting and less safer than SERMs, D. Administered as once a month i.m. dose
C: Is slower and short acting and less safer than SERMs
Answer: C: Is slower and short acting and less safer than SERMs 
Explanation: None