Assertion: methadone | /r/PartOf | a class of drugs
Facets:
Source sentences:
text: Methadone belongs to a class of drugs known as opioid (narcotic) analgesics.
text: Methadone belongs to a class of drugs known as narcotic (opiate) analgesics.
text: Methadone belongs to a class of drugs known as narcotic (opiate) analgesics.
text: Methadone belongs to a class of drugs known as opioid analgesics.