Which pair correctly identifies naturally occurring opiates?

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Multiple Choice

Which pair correctly identifies naturally occurring opiates?

Explanation:
Natural opiates come directly from the opium poppy. Morphine and codeine are two major alkaloids that occur in opium without synthetic modification, making them classic naturally occurring opiates. The other options are not natural: fentanyl and sufentanil are fully synthetic opioids; methadone is synthetic; oxycodone and buprenorphine are semi-synthetic (chemically altered from opium alkaloids); naloxone is a synthetic opioid antagonist. So the pair that represents naturally occurring opiates is morphine and codeine.

Natural opiates come directly from the opium poppy. Morphine and codeine are two major alkaloids that occur in opium without synthetic modification, making them classic naturally occurring opiates. The other options are not natural: fentanyl and sufentanil are fully synthetic opioids; methadone is synthetic; oxycodone and buprenorphine are semi-synthetic (chemically altered from opium alkaloids); naloxone is a synthetic opioid antagonist. So the pair that represents naturally occurring opiates is morphine and codeine.

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