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': 'Fetal Hb shows high pO2 saturation compared to adult Hb because ? \nSelect and explain. \nA. Affinity to binding to DPG is different in fetal Hb, B. Right shift to Oxygen dissociation curve, C. Acidic environment, D. Cooperative binding', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Affinity to binding to DPG is different in fetal Hb", 'role': 'assistant'}]