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: B i.e. Blood transfusion