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: Surgery
[{'content': 'Statistically impoant risk factors identified for breast cancer- \nSelect and explain. \nA. Early age at marriage, B. Females of non vegetarian diet, C. Those who have not breast fed their children, D. Smoking', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e. Those who have not breast fed their children", 'role': 'assistant'}]