All are cholinergic agents except I: (A) Galantamine, (B) Donepezil, (C) Tacrine, (D) Memantine
Answer is D. Refer kDT 6/e p 472,473 Donepazil, rivastigmine, gallantamine and tacrine are cholinergic drugs( due to inhibition of cholenesterase enzyme)useful for Alzheimer's disease Memantine is an NMDA blocker, used for Alzheimer's disease