Which of the following is not a correct statement regarding methadone?

Which of the following is not a correct statement regarding methadone?
A . Methadone was synthesized in Germany during World War II because of a shortage of morphine.
B . Methadone was introduced to the United States in 1947 and was distributed under such names as amidone, dolophine, and methadone.
C . Methadone is chemically like morphine and heroin.
D . Methadone was widely used in the 1960s in the treatment of narcotic addicts.
E . Methadone is only effective when administered by injection.
F . Both c and

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Answer: F