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': 'Normal pO2 in venous blood is: \nSelect and explain. \nA. 40 mmHg, B. 60 mmHg, C. 80 mmHg, D. 95 mmHg', 'role': 'user'}, {'content': 'Answer: A \nExplanation: pO2 of the aerial blood = 95 mmHg pO2 of venous blood = 40 mmHg pCO2 of the aerial blood = 40 mmHg pCO2 of venous blood = 45 mmHg', 'role': 'assistant'}]