This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Anatomy
[{'content': "Vitum's sign is seen in \nSelect and explain. \nA. AR, B. MS, C. AS, D. TR", 'role': 'user'}, {'content': 'Answer: D \nExplanation: .', 'role': 'assistant'}]