Which of the following statements about opioids is incorrect?

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Pentazocine and buprenorphine are opioid medications.Pentazocine can trigger withdrawal symptoms in patients dependent on opioids.Partial opioid agonists do not cause the typical adverse effects associated with opioids.Ethomorphine shares chemical similarities with pethidine.

Explanation

Option C is incorrect because partial agonists can still produce classic opioid side effects, although sometimes to a lesser extent. The other statements are accurate: pentazocine and buprenorphine are opioids, pentazocine may induce withdrawal in opioid-dependent individuals, and ethomorphine is chemically related to pethidine.