Assertion: morphine | /r/HasProperty | the standard
Facets:
value: for comparing the strength of opioids
type: PURPOSE
Source sentences:
text: Morphine is the prototypical opioid and is the standard against which other opioids are tested.
text: The U.S. Drug Enforcement Administration says morphine is the standard against which other analgesics are measured.
text: Morphine is the standard for comparing the strength of opioids.