This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Psychiatry, Subject name: Medicine
[{'content': "Reversible Dementia Is a feature of ? \nSelect and explain. \nA. Hyperparathyroidism, B. Hypothyroidism, C. Hyperthyroidism, D. Cushing's disease", 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Hypothyroidism Causes of reversible dementiao Hypothyroidismo Normal pressure hydrocephaluso Depressiono Drugso Alcoholo Vitamin B12 deficiency", 'role': 'assistant'}]