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 1, Subject name: Physiology
[{'content': 'In a man weighing 200 pounds, the volume of anatomic dead space would be (approx.): \nSelect and explain. \nA. 100 mL, B. 150 mL, C. 200 mL, D. 250 mL', 'role': 'user'}, {'content': "Answer: C \nExplanation: Although 150 mL is said to the volume of dead space in adults, it can not be exactly the same in every individual. Anatomic dead space volume would depend on the size of the respiratory system, which in turn would depend upon the body size. Hence, a rough estimate of the dead space volume can be determined as: anatomic dead space = 1 mL per pound of the body weight. This is known as Radford's formula", 'role': 'assistant'}]