A 62-Year-Old Man Is Brought to the Office by His

A 62-year-old man is brought to the office by his son due to memory impairment and frequent falls.  The patient has been living alone since the death of his wife a year ago.  His son, who is visiting from out of town, found his father in poor living conditions.  The patient was forgetful and did not know the location of various items in his house, where he has lived for more than 20 years.  His gait is also unsteady, and he had had several falls.  The son says his father has always been "a drinker" and may have been drinking more recently.  The patient is indifferent to his son's concerns and says he feels fine.  Vital signs are within normal limits.  On physical examination, bilateral lateral gaze palsy and nystagmus are present.  Muscle strength and deep tendon reflexes are normal, but the gait is ataxic.  On memory testing, he recalls 0 out of 3 objects after 5 minutes.  A lesion of which of the following labeled structures on a normal brain MRI is most specifically associated with this patient's current condition?

A) A
B) B
C) C
D) D
E) E
F) F

Correct Answer:

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