A Man,aged 84 Years,was Stopped for Going Through a Red

A man,aged 84 years,was stopped for going through a red light in a small town where he has lived all his life.He told the officer,"It wasn't there yesterday." He was unable to tell the officer his address and demonstrated labile mood,seeming pleasant one minute and angry the next.The officer took the man home to discuss his condition with the family and found that he lives with his wife,who is legally blind.She stated,"He's my eyes,and I'm his mind." She also related that her husband wanders around the neighborhood,sometimes taking tools from people's garages,saying they belong to him.She reluctantly agreed that he should go to the emergency department for evaluation.He was diagnosed with Alzheimer's disease.What cardinal sign of Alzheimer's disease does this patient demonstrate?

A) Aphasia
B) Apraxia
C) Agnosia
D) Amnesia

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