Mr. White's son brings him in today because he notes that Mr. White has not been himself lately. He seems forgetful and has not taken care of himself as he normally does. He has reported falling twice at home to his son and has telephoned late at night because of insomnia. His blood pressure and diabetes have been difficult to control and his warfarin dosing has become more difficult.
Which of the following should you suspect?

A) Alzheimer's dementia
B) Alcohol use
C) Urinary tract infection
D) Stroke