Which of the following is an example of a Schedule I controlled substance?

Name: Which of the following is an example of a Schedule I controlled substance?
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Heroin has no currently accepted medical use in the United States and there is a lack of accepted safety guidelines for its use under medical supervision.Morphine and pentobarbital are both Schedule II controlled substances;Lomotil (diphenoxylate with atropine sulfate)is a Schedule V drug.

Which of the Following Is an Example of a Schedule