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: Surgery
[{'content': 'Age for regular mammography is \nSelect and explain. \nA. 20, B. 30, C. 40, D. 50', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Screening mammography: For screening purpose it is done after 40 years. Early screening is indicated when there is family history of carcinoma breast or histological risk factor. Mammography before 35 years of age is usually not done unless there is a suspicious lump or a strong family history. Screening is done in asymptomatic female where even cancer is suspected. Ref; (page no; 515) 5th edition of SRB&;S manual of Surgery.', 'role': 'assistant'}]