This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Medicine
All except one is required for the diagnosis of obesity hypoventilation syndrome 
Select and explain. 
A. Hypeension, B. Sleep disorder breathing, C. BMI more than or equal to 30 kg/m2, D. PaCO2 more than or eqal to 45 mmHg
A: Hypeension
Answer: A: Hypeension 
Explanation: Repeated