The correct option is
A Opiate narcotic
Methadone is a synthetic opiate and sold under the name dolophine. Opiates are derived from opium which is dried latex of unripen capsular fruits of Papaver somniferum (poppy plant). They are considered as the king of narcotics. They bind to specific receptors in brain and affect many functions of body like slowing down respiration, decreased glandular secretions, nausea and vomiting etc.
So, the correct answer is 'Opiate narcotic'.