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': 'All except one are risk factors for obstructive sleep apnea \nSelect and explain. \nA. BMI > 30.3, B. Feeling tired during daytime, C. Being treated for hypertension, D. Neck circumference >40cm', 'role': 'user'}, {'content': 'Answer: A \nExplanation: BMI > 35.6 is a risk factor for obstructive sleep apnea syndrome.', 'role': 'assistant'}]