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: Medicine
[{'content': 'All of the following criteria are required for diagnosis of obesity hypoventilation syndrome except - \nSelect and explain. \nA. Hypeension, B. Sleep disorder breathing, C. BMI 30 kg/m2, D. PaCO2. 45 mmHg', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Answer- A. HypeensionOHS is defined as daytime hypercapnia and hypoxemia in an obese patient with sleep-disordered breathing in the absence of any other cause of hypoventilation', 'role': 'assistant'}]