Final answer:
Reversible anticholinesterase inhibitors are used in treating Alzheimer's disease by increasing the levels of acetylcholine in the brain, which may improve neuron communication and slow the progression of symptoms.
Step-by-step explanation:
The correct answer to the question regarding the use of reversible anticholinesterase inhibitors in treating Alzheimer's disease is: (a) They increase the levels of acetylcholine in the brain. These drugs, including Aricept, inhibit acetylcholinesterase and prevent the breakdown of acetylcholine, thereby enhancing cholinergic neurotransmission. Enhancing cholinergic neurotransmission may improve neuron communication and slow symptom progression in Alzheimer's disease.