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': 'Bronchial circulation is associated with \nSelect and explain. \nA. Air conditioning, B. Drug absorption, C. Gaseous exchange, D. Reserve volume', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]