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': 'Maximum CO2 is seen in ? \nSelect and explain. \nA. Pulmonary vein, B. Pulmonary aery, C. Left ventricle, D. Left atrium', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Pulmonary aeryPulmonary aeries carry deoxygenated blood (with maximum CO2) to lung from right ventricle.In lung CO2 is removed and oxygenation of blood takes place.Pulmonary veins, then, transpo this oxygenated blood (with less CO2) to the left atrium.", 'role': 'assistant'}]