What one other test can you do to confirm the presence of sensory ataxia?

While waiting to see your patients in the neurology clinic you notice a patient walk in with an abnormal gait (See image below). What one other test can you do to confirm the presence of sensory ataxia?

image

A. Ask patient to get up from the floor from a squatting position
B. Tap gently on the glabella
C. Ask the patient to stand with eyes closed and feet together
D. Remove 30 ml of cerebrospinal fluid and reassess cognition