John is in his early 60s. He has difficulties in remembering basic information, such as his own address. He often fails to recognize people and cannot carry out simple motor activities. John initially experienced loss of memory a few years ago; over time these symptoms have increased. He does not experience any fluctuations in consciousness. John is unable to carry out day-to-day activities. Which of the following diagnoses would best fit John's condition?
A. Delirium
B. Trisomy 21
C. Alzheimer's disease
D. Somatic symptom disorder
Answer: C
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