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: Anatomy
[{'content': 'The structure derived from the right fourth aortic arch- \nSelect and explain. \nA. Right common carotid artery, B. Right subclavian artery, C. Aortic arch, D. None of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]