Donald is seventy years old. For the past few years, he has developed a memory loss that is getting worse, and his personality has become very erratic. His doctors say he has Alzheimer's disease, but you aren't sure. What finding should most convince you that the doctors are right?
A. A loss of GABA neurons in Donald's brain
B. An absence of myelin in Donald's brain
C. A loss of acetylcholine neurons in Donald's brain
D. Below-normal levels of norepinephrine in Donald's brain
Answer: C
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