This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2018, Subject name: Medicine
[{'content': 'Vitamin B12 deficiency can lead to all EXCEPT: \nSelect and explain. \nA. Myopathy, B. Peripheral neuropathy, C. Optic atrophy, D. Myelopathy', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Myelin formation requires B12 If B12| - myelination | | So, 1) Peripheral neuropathy 2) Optic atrophy 3) Myelopathy But Not Myopathy 4) SACD spinal cord (Sub-acute combine degeneration of spinal cord)', 'role': 'assistant'}]