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: Surgery
[{'content': 'Carotid body tumours \nSelect and explain. \nA. Arises from the endothelial cells, B. Originates from the Schwann cells, C. R/T is the Rx of choice, D. May metastasize', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Carotid body tumors may metastasize in rare cases.', 'role': 'assistant'}]