This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'Decrease in diffusion is diagnosed by: \nSelect and explain. \nA. DLCO, B. Spirometer, C. Both, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: DLCO Stands for diffusion capacity for carbon monoxide It is used to estimate diffusion capacity of the lungs', 'role': 'assistant'}]