This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Physiology
[{'content': 'Myoglobin binds with \nSelect and explain. \nA. 1 mol of oxygen per mol, B. 2 mol of oxygen per mol, C. 3 mol of oxygen per mol, D. 4 mol of oxygen per mol', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Myoglobin is specialized for sustained muscular contraction. It has only one heme group and does not show Bohr effect.', 'role': 'assistant'}]