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': 'Anatomical dead space of normal lung is \nSelect and explain. \nA. 150 ml, B. 250 ml, C. 300 ml, D. 350 ml', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]