Review Question - QID 217811

A 64-year-old man presents to his primary care physician with his daughter. His past medical history is significant for hyperlipidemia and coronary artery disease. He has no complaints during today's visit; however, his daughter wants to discuss some behavior changes she has noted. She reports that the patient has seemed more forgetful over the last 6 months and often does not remember recent events or conversations. She states that she taught the patient how to use a new cell phone a few months ago, but that he now struggles to use it and make phone calls. On physical exam, his temperature is 98.6°F (37°C), blood pressure is 110/80 mmHg, pulse is 90/min, and respirations are 12/min. Examination of the cranial nerves, motor activity, and sensation is unremarkable. The patient remembers 1 out of 3 words on delayed recall. Which of the following is the most likely diagnosis?