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 right in all except: \nSelect and explain. \nA. Diabetic ketoacidosis, B. Blood transfusion, C. High altitude, D. Anaemia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Blood transfusion', 'role': 'assistant'}]