Which of the following is a cause of reversible dementia?: (A) Subacute combined degeneration., (B) Picks disease, (C) Creutzfeldt - Jakob disease., (D) Alzheimer's disease
Answer is A. Answer is A (Subacute combined degeneration) `Subacute combined degeneration' is caused by vitamin B12 deficiency. Vitamin deficiencies including vitamin B,2 deficiency constitute potentially reversible causes of dementia.