A 68-year-old man is brought to the attention of his doctor because his wife says that his memory is poor and he has appeared vague and inattentive for the past 3 months. He is a retired physician but...

A 68-year-old man is brought to the attention of his doctor because his wife says that his memory is poor and he has appeared vague and inattentive for the past 3 months. He is a retired physician but has difficulty giving his previous medical history when asked (it is notable for HTN and BPH). His wife mentions that he had a fall in the shower preceding this change, and he was able to recite esoteric medical facts in great detail before the fall occurred. What is the most likely cause of his mental status change?

A. Meningioma

B. Subdural hematoma

C. Fungal meningitis

D. Alzheimer dementia

E. Viral meningitis