All are chlolinergic agents except: (A) Galantamine, (B) Donepezil, (C) Tacrine, (D) Memantine
Answer is D. Donepezil,rivastigmine,gallantamine and tacrine are cholinergic (due to inhibition of cholinesterase enzyme) drugs useful for alzheimer's disease. Memantine is an NMDA blocker,used for Alzheimer's disease. Ref-KDT 6/3 p472,473