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': 'Standard views for mammography are: \nSelect and explain. \nA. AP and Lateral, B. AP and Medio-lateral oblique, C. Cranio-caudal and Medio-lateral view, D. Cranio-caudal and Medio-lateral oblique', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The two standard mammographic projections are:\nA mediolateral oblique (MLO) view and a craniocaudal (CC) view.\nThe MLO is taken with the X-ray beam directed from superomedial to inferolateral, usually at an angle of 30°-60°.\nThe MLO projection is the only projection in which all the breast tissue can be demonstrated in a single image.\nIn CC view, the X-ray beam travels from superior to inferior. Positioning is achieved by pulling the breast up and forward away from the chest wall, with compression applied from above.', 'role': 'assistant'}]