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
Oxygen dissociation cure is shifted to left by all except - 
Select and explain. 
A. Increased pH, B. Decrease PCO2, C. Decreased 2,3 DPG, D. Decreased pH
D: Decreased pH
Answer: D: Decreased pH 
Explanation: Ans. is 'd' i.e., Decreased pH