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: Unknown
[{'content': 'On MRI the differential diagnosis of spinal cord edema is: \nSelect and explain. \nA. Mylodysplasia, B. Myelomalacia, C. Myelochisis, D. Cord tumors', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]