Methadone Is Thought to Be Effective Because It

Multiple Choice

Methadone is thought to be effective because it

A) blocks just 25-35% of opioid receptor sites, enough to create a corrective but not curative effect.
B) binds to narcotic analgesic molecules in the blood, preventing them from forming chemical bonds with blood proteins and thus being more easily removed from the circulation.
C) is able to block 50% of the mu receptor sites without activating them.
D) activates only the kappa opioid receptor sites, causing dysphoria should the individual abuse opioids.