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: Unknown
[{'content': 'What is the indication for surgery in asymptomatic patients with abdominal aortic aneurysm? \nSelect and explain. \nA. Transverse diameter > 3 cm, B. Transverse diameter > 5.5 cm, C. Transverse diameter > 7.5 cm, D. No need for surgery unless symptomatic', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Most precise test for imaging aortic aneurysm : CT scan\n5-year risk of rupture for aneurysm :<5cm – 1 to 2% and > 5 cm-20 to 40%\nFor asymptomatic abdominal aortic aneurysms, operation is indicated if the diameter is > 5.5 cm\nIn elective surgery of AAA, the operative mortality rate is 1 to 2% whereas after acute rupture the mortality of emergency operation is >50%\nMC complications after repair are Cardiac (ischemia and infarction) & Respiratory (atelectasis & lower lobe consolidation)\nMC non-cardiac complication after repair of AAA is Renal failure.', 'role': 'assistant'}]