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': 'In an obese patient the most likely respiratory change is \nSelect and explain. \nA. FRC is unchanged, B. Alveolar hypo ventilation, C. Residual volume is decreased, D. Normal work of breathing', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Obesity hypoventilation syndrome is characterized by :\n\nObesity.\nHypoxemia.\nHyper carbia.\nRespiratory acidosis.\nPulmonary hypertension.\nRight ventricular failure.', 'role': 'assistant'}]