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: Pathology
[{'content': 'All are risk factor for breast ca except - \nSelect and explain. \nA. OCP, B. Early mensturation, C. Family history, D. Late menopause', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., OCP", 'role': 'assistant'}]