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 are true about subacute combined degeneration of spinal cord except - \nSelect and explain. \nA. Due to deficiency of vitamin B12, B. Posterior column involvement, C. Corrticospinal involvement, D. Absent deep tendon reflexes', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]