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': 'Physiologial response to smokking are all except \nSelect and explain. \nA. Decreased HDL, B. Increased hematocrit, C. Increased heart rate and increased catecholamine release, D. Decreased caboxyhemoglobin', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]