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: Physiology
[{'content': 'The gradient of alveolar arterial oxygen tension increases in All except \nSelect and explain. \nA. Diffusion defect, B. Right left shunt, C. Hypoventilation, D. Ventilation perfusion abnormality', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]