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': 'Which of the following is the best determinant of adequacy of alveolar ventilation? \nSelect and explain. \nA. Aerial pO2 level, B. Aerial pCO2 level, C. Minute ventilation, D. Presence of cyanosis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Atrial pco2 content determines the alveolar ventilation Ref: guyton and hall textbook of medical physiology 12 edition page number:331,332,333', 'role': 'assistant'}]