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 cure is shifted to left by all except - \nSelect and explain. \nA. Increased pH, B. Decrease PCO2, C. Decreased 2,3 DPG, D. Decreased pH', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Decreased pH", 'role': 'assistant'}]