AAMC Guide Questions P/S #14

This question is driving me crazy. If their supposed answer is correct, then why do people take suboxone??????

This is from the AAMC Official guide questions, the Psych/Soc section.

Question 14
If heroin-dependent rats were injected with naloxone, the naloxone would:

A. Reduce the reinforcing effects of heroin.
This is incorrect because an endorphin antagonist will increase the reinforcing effects of heroin, not decrease these effects.

B....

AAMC Guide Questions P/S #14