A 70-year-old man walks in the office unassisted and is swaying from one side to the other. Which of the following screening tests should be used to identify cerebellar function in this patient?

Choice A reason: This is correct. Rapid alternating movements (dysdiadochokinesia) and the finger-to-nose test assess cerebellar coordination and fine motor control, which are essential components in evaluating cerebellar function. Choice B reason: Balancing and copying a polygon evaluate balance and visuospatial skills but are less specific for cerebellar dysfunction. Choice C reason: Stereognosis assesses sensory function, not cerebellar function. The Romberg test evaluates proprioception rather than cerebellar coordination. Choice D reason: The Romberg test assesses sensory input for balance, and the Weber test evaluates hearing. Neither is specific for cerebellar function.