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 hemoglobin has higher affinity for oxygen due to: \nSelect and explain. \nA. Decreased 2, 3 DPG concentration, B. Reduced pH, C. Increased release of carbon dioxide, D. Oxygen dissociation curve is shifted to right', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Decreased 2, 3 DPG concentration', 'role': 'assistant'}]