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': 'CABG is done for all of the following indications except - \nSelect and explain. \nA. To reduces symptoms, B. To prevent further catastrophes, C. To prolong life, D. To prevent progress of native blood vessel disease', 'role': 'user'}, {'content': 'Answer: D \nExplanation: A successful CABG reduces symptoms, prevents catastrophic and prolongs survival.\nIt does not prevent the progress of native blood vessel disease. In fact, restenosis of the grafted vessel is noted with time.\nIn CABG, anastomosis of one or both of the internal mammary arteries or a radial artery to the coronary artery distal to the obstructive lesion is carried out.\nFor additional obstructions that cannot be bypassed by an artery, a section of a vein (usually the saphenous) is used to form a connection between the aorta and the coronary artery distal to the obstructive lesion.', 'role': 'assistant'}]