This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General physiology, Subject name: Physiology
[{'content': 'Which of the following will not cause a low lung diffusing capacity(DL)? \nSelect and explain. \nA. Decreased diffusion distance, B. Decreased capillary blood volume, C. Decreased surface area, D. Decreased cardiac output', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A decrease in the diffusion distance will lead to an increase in DL. A decrease in capillary blood volume, surface area, cardiac output, and blood hemoglobin concentration will decrease DL.', 'role': 'assistant'}]