question: Q:A 73-year-old woman is brought to the physician by her son because of increasing forgetfulness over the past 2 years. Initially, she used to misplace keys and forget her dog's name or her phone number. Now, she often forgets about what she has seen on television or read about the day before. She used to go for a walk every morning but stopped one month ago after she became lost on her way back home. Her son has prevented her from cooking because she has had episodes of leaving the gas stove oven on after making a meal. She becomes agitated when asked questions directly but is unconcerned when her son reports her history and says he is overprotective of her. She has hypertension, coronary artery disease, and hypercholesterolemia. Current medications include aspirin, enalapril, carvedilol, and atorvastatin. She is alert and oriented to place and person but not to time. Vital signs are within normal limits. Short- and long-term memory deficits are present. Her speech rhythm is normal but is frequently interrupted as she thinks of words to frame her sentences. She makes multiple errors while performing serial sevens. Her clock drawing is impaired and she draws 14 numbers. Which of the following is the most likely diagnosis?? 
  {'A': 'Normal pressure hydrocephalus', 'B': 'Lewy-body dementia', 'C': 'Frontotemporal dementia', 'D': 'Creutzfeld-Jakob disease', 'E': 'Alzheimer disease'},