Naloxone, according to the passage, is a endorphin antagonist. This question does seem counterintuitive at first. Instead of seeing two different drugs, see the two drugs as doing the same thing.
ABA (endorphin addicted) rats stopped using heroine because they were addicted to endorphins. If a heroine addicted rat was injected with a drug (naloxone) that made it impossible to experience endorphins, that rat would be even less likely to exercise, thus, worsening his addiction - or increasing the effects/desire for heroine.
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Heroin and endorphin? AAMC The Official MCAT Practice Question section3 Q #14
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