Which of the following do some researchers claim is an early symptom of Alzheimer's disease?

Name: Which of the following do some researchers claim is an early symptom of Alzheimer's disease?
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Some researchers have found that depression can be an early symptom of Alzheimer's disease. People with depression may be at higher risk of developing Alzheimer's later in life. Anxiety, schizophrenia, and mania are not typically associated with early symptoms of Alzheimer's disease.

Which of the Following Do Some Researchers Claim Is an Early