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: Anaesthesia
[{'content': 'The most common cause of morbidity and mortality in patients undergoing major vascular surgery is – \nSelect and explain. \nA. Renal complications, B. Thromboembolic phenomenon, C. Coagulopathies, D. Cardiac complications', 'role': 'user'}, {'content': 'Answer: D \nExplanation: "Myocardial performance is the single most important determinant of outcome following a major vascular operation. "\n"Non fatal and fatal MIs are the most important and specific outcomes that determine perioperative cardiac morbidity in patient for vascular surgery."', 'role': 'assistant'}]