Only three elements need to be present for a fire to start. Which of the following is not one of the noted elements?

A(n) ________ is used to thin out mucus

A) expectorant B) cough suppressant C) antitussive D) decongestant

Central nervous system drugs:

A) eliminate pain during surgery. B) usually affect the whole body. C) are analgesics. D) both A and B.