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': 'Which of the following statement is true about Hb-O2\n dissociation curve? \nSelect and explain. \nA. Fetal Hb shifts curve to left, B. Hypothermia shifts curve to right, C. Hypercarbia shifts curve to left, D. Left shift cause more O2 release', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]