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: Pathology
[{'content': 'As a general rule, veins carry \nSelect and explain. \nA. Urine, B. Lymph fluid, C. Oxygenated blood, D. Deoxygenated blood', 'role': 'user'}, {'content': 'Answer: D \nExplanation: All veins carry deoxygenated blood from the body to the heart with the exception of the pulmonary vein\nwhich carries oxygenated blood from the lungs to the heart.', 'role': 'assistant'}]