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': 'Oxygen dissociation curve shifts to the right by all of the following except: \nSelect and explain. \nA. Rise in temperature, B. Rise in carbon dioxide tension, C. Rise in pH, D. Rise in H + ion', 'role': 'user'}, {'content': 'Answer: C \nExplanation: A shift to the left indicates acceptance of oxygen by hemoglobin and the shift to right indicates dissociation of oxygen from hemoglobin. Factors favoring shift to right are —\n\nDecreased PO2\nIncreased PCO2 (Bohr effect)\nIncrease in H+ concentration or decreased pH\nExcess of 2, 3 DPG (exercise, high altitudes)\nIncreased body temperature', 'role': 'assistant'}]