Questions: Current knowledge regarding the cause of Alzheimer disease is a deficiency in which neurochemical in the Answers: A - D A acetylcholine B dopamine C glutamate D serotonin

The answer is the first one (or A): acetylcholine.

Explanation for each option:

A. Acetylcholine - Correct. Alzheimer's disease is primarily associated with a deficiency in acetylcholine, a neurotransmitter that plays a crucial role in memory and learning. The loss of acetylcholine-producing neurons is a hallmark of Alzheimer's disease.

B. Dopamine - Incorrect. Dopamine is more commonly associated with Parkinson's disease, where there is a deficiency of dopamine in the brain. It is not the primary neurochemical involved in Alzheimer's disease.

C. Glutamate - Incorrect. While glutamate is involved in cognitive functions and its dysregulation can contribute to neurodegenerative diseases, it is not the primary neurochemical deficiency in Alzheimer's disease.

D. Serotonin - Incorrect. Serotonin is primarily involved in mood regulation and is more commonly linked to conditions such as depression and anxiety. It is not the main neurochemical deficiency in Alzheimer's disease.

Summary: The primary neurochemical deficiency in Alzheimer's disease is acetylcholine.