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': 'In morbid obesity BMI is greater than? \nSelect and explain. \nA. 30, B. 35, C. 40, D. 45', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 40 REF: Sabiston Textbook of Surgery, 18th ed chapter 17 Morbid obesity is defined as being either 100 lb above ideal body weight, twice ideal body weight, or a body mass index (BMI, measured as weight in kilograms divided by height in meters squared) of 40 kg/m2. The latter definition is more accepted internationally and has essentially replaced the former ones for all practical and scientific purposes.', 'role': 'assistant'}]