This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2019, Subject name: Anatomy
[{'content': "Reversible dementia is seen in? \nSelect and explain. \nA. Alzheimer's disease, B. Hypothyroidism, C. Subacute demyelination of spinal cord, D. Pick's disease", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Causes of Reversible dementia: Hypothyroidism (Myxoedema) Thiamine deficiency Vitamin B12 deficiency Normal pressure hydrocephalus (NPH) Subdural hematoma Chronic infection Brain abscess', 'role': 'assistant'}]