<prompt> Answer this question truthfullyIn an obese patient with daytime hypercapnia, hypoxemia, and respiratory acidosis, what is the likely diagnosis?  <response>: <reason> The likely diagnosis in this case is obesity hypoventilation syndrome. Obesity hypoventilation syndrome is a condition that occurs in obese individuals who have difficulty breathing during sleep, leading to elevated levels of carbon dioxide hypercapnia, decreased oxygen levels hypoxemia, and respiratory acidosis. Symptoms may include daytime fatigue, headaches, and shortness of breath. Treatment may involve weight loss, the use of non-invasive positive pressure ventilation NIPPV, and supplemental oxygen therapy. 