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 curve shifts to right in all except 
Select and explain. 
A. Diabetic ketoacidosis, B. Blood transfusion, C. High altitude, D. Anaemia
B: Blood transfusion
Answer: B: Blood transfusion 
Explanation: Hb-O2 dissociation curve shift to left indicates more affinity of Hb to O2, and thus less delivery of O2 to tissues. In stored blood, 2,3 DPG levels are decreased.
 
Shift to left seen in
-        Increased pH
-        Decreased 2,3 DPG, temperature, PCO2
-        HbF (Fetal)
 
Shift to right seen in
-        Decreased pH
-        Increased 2,3DPG, temperature, PCO2
-        HbS (Sickle cell)