**Core Concept**
Alzheimer's disease is a neurodegenerative disorder characterized by progressive cognitive decline, memory loss, and dementia. Treatment aims to manage symptoms, slow disease progression, and enhance quality of life. Various pharmacological agents are employed, including cholinesterase inhibitors, memantine, and combination therapies.

**Why the Correct Answer is Right**
The primary treatment options for Alzheimer's disease include:
* Cholinesterase inhibitors (e.g., donepezil, rivastigmine) that increase acetylcholine levels by inhibiting its breakdown.
* Memantine (NMDA receptor antagonist) that reduces excitotoxicity and neuronal damage.
* Combination therapies involving cholinesterase inhibitors and memantine.

**Why Each Wrong Option is Incorrect**
**Option A:** Donepezil is used in the treatment of Alzheimer's disease for its cholinesterase inhibiting properties, making it a correct treatment option.
**Option B:** Memantine is also used in Alzheimer's disease for its ability to reduce excitotoxicity and neuronal damage, making it a correct treatment option.
**Option C:** Rivastigmine is a cholinesterase inhibitor used in the treatment of Alzheimer's disease, making it a correct treatment option.

**Clinical Pearl / High-Yield Fact**
It's essential to note that Alzheimer's disease has no cure; treatment focuses on managing symptoms and slowing disease progression. Early diagnosis and initiation of treatment can improve quality of life for patients and their caregivers.

**Correct Answer:** D