Which of the following statements is NOT true about P. V. T. ？A．It is a standard of sleepi

Which of the following statements is NOT true about P. V. T. ？

A．It is a standard of sleepiness measures.

B．It is an easy but thought-provoking test.

C．It can tell a lapse into sleepiness.

D．It can measure the sustained attention.

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