This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology and breast, Subject name: Anatomy
Risk factors for carcinoma breast are all except 
Select and explain. 
A. Nulliparity, B. Family history, C. OCP, D. BRCA-1 Mutation
C: OCP
Answer: C: OCP 
Explanation: .