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': 'An increase in which of the following parameters will shift the O2 dissociation curve to the left \nSelect and explain. \nA. Temperature, B. Partial pressure of CO2, C. 2,3 DPG Concentration, D. Oxygen affinity of haemoglobin', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]