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': 'The factor responsible for the left shift of Hb-02 dissociation curve is: \nSelect and explain. \nA. Increase in 2,3 DPG in RBC, B. Fall in temperature, C. Fall in pH, D. Increase level of CO2 in blood', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Fall in Temperature', 'role': 'assistant'}]