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: Medicine
[{'content': 'All of the following can lead to trophic ulcers in the fingers except - \nSelect and explain. \nA. Cervical disc prolapse, B. Subacute combined degeneration of spinal cord, C. Leprosy, D. Syringomyelia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]