For Many Opioids,pharmacological Effects Continue After Catabolism Because

Multiple Choice

For many opioids,pharmacological effects continue after catabolism because:

A) of the activation of endogenous opioids.
B) opioids receptors remain activated after the drug is eliminated from the body.
C) the user quickly uses another opioid.
D) biotransformation leads to active metabolites that act as opioid compounds.