Donepezil is prescribed to treat which of the following conditions?

Donepezil is primarily prescribed for the treatment of Alzheimer's disease. It is an acetylcholinesterase inhibitor that works by increasing the levels of acetylcholine in the brain, which is important for learning and memory. Alzheimer's disease is characterized by the degeneration of neurons and a decline in cognitive function, and the use of donepezil can help improve symptoms or slow their progression, providing some symptomatic relief for patients.

The other conditions mentioned do not involve a similar mechanism or underlying pathology that would make donepezil an appropriate choice. For instance, Guillain Barré syndrome is an autoimmune disorder affecting the peripheral nervous system, Parkinson’s disease primarily involves dopamine deficiencies, and Meniere’s disease is related to inner ear issues affecting balance and hearing. Thus, donepezil’s role is specifically tailored to manage cognitive decline associated with Alzheimer's disease, making it the correct choice in this context.