question: Q:An 81-year-old man is brought to the physician by his daughter after being found wandering on the street. His daughter says that over the past several months he has been more aggressive towards friends and family. She also reports several episodes in which he claimed to see two strangers in her apartment. He sometimes stares blankly for several minutes and does not react when addressed. He has hypertension, hyperlipidemia, and was diagnosed with Parkinson disease 10 months ago. His current medications include carbidopa-levodopa, hydrochlorothiazide, and atorvastatin. His temperature is 37°C (98.6°F), pulse is 99/min, and blood pressure is 150/85 mm Hg. He is confused and oriented to person and place but not to time. There is a resting tremor in his right upper extremities. There is muscle rigidity in the upper and lower extremities. He is able to walk without assistance but has a slow gait with short steps. Mental status examination shows short-term memory deficits. Which of the following is the most likely underlying cause of this patient's condition?? 
  {'A': 'Lewy body deposition', 'B': 'Vascular infarcts', 'C': 'Frontotemporal lobe atrophy', 'D': 'Thiamine deficiency', 'E': 'Impaired CSF absorption'},