This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cystic fibrosis & Sleep apnea, Subject name: Medicine
[{'content': 'All of the following criteria are used for diagnosis of obesity hypoventilation syndrome except \nSelect and explain. \nA. Hypeension, B. Sleep disorder breathing, C. BMI >= 30 Kg/ m2, D. PaCO2>= 45mmhg', 'role': 'user'}, {'content': 'Answer: A \nExplanation: CRITERIA for Obesity Hypoventilation syndrome - BMI >30 PCO2 > 45 mmHg Sleep disordered breathing', 'role': 'assistant'}]