The correct option is
C Methadone
Methadone is a synthetic opioid. Opiates drugs or opioids are derived from opium, the dried latex of unripen capsular fruits of poppy plant Papaver somniferum. They have analgesic, sedative and narcotic effects. Methadone is used for relieving pain. It prevents the withdrawal symptoms associated with opiates. It is sold under the trade name of dolophine.
So, the correct answer is 'Methadone'.