Which of the following are good tests of the equilibrium apparatus?
A) standing and simultaneously beginning a task that requires mental concentration
B) being rotated on a chair, after which the observers look for nystagmus
C) walking in a straight line, one foot in front of the other
D) walking in a straight line placing one foot in front of the other, standing and simultaneously beginning a task that requires mental concentration, and being rotated on a chair, after which the observers look for nystagmus
Answer: D
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