This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory System Pa 2, Subject name: Physiology
[{'content': 'Myoglobin dissociation curve is: \nSelect and explain. \nA. Almost linear, B. Parabola, C. Rectangular hyperbola, D. Sigmoid', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Myoglobin dissociation curve is: Rectangular hyperbola. P50for myoglobin (PO2at which 50% of myoglobin is saturated)- 5 mmHg. Myoglobin has high affinity for O2.', 'role': 'assistant'}]