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: Unknown
[{'content': "Hemoglobin's affinity for oxygen is increased due to ? \nSelect and explain. \nA. An increase in CO2, B. Raise in the temperature, C. Higher value, D. A decrease in 2,3 DPG", 'role': 'user'}, {'content': 'Answer: D \nExplanation: ANSWER: D A decrease in 2,3 DPG', 'role': 'assistant'}]