PLE-5944

A 72-year-old man is brought to the physician by his daughter because of a 7-month history of difficulty with memory. He frequently loses his keys and misses appointments and regular family dinners. He lives alone, but recently family members had to drive him on errands and help him with daily tasks at home. He has not had difficulty sleeping and does not use illicit drugs. Mental status examination shows an irritable mood and labile affect. There is no evidence of depressed mood, anxiety, or hallucinations. Which of the following is the most appropriate pharmacotherapy for this patient?