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
[{'content': 'Risk factors for carcinoma breast are all except \nSelect and explain. \nA. Nulliparity, B. Family history, C. OCP, D. BRCA-1 Mutation', 'role': 'user'}, {'content': 'Answer: C \nExplanation: .', 'role': 'assistant'}]