Naloxone (Narcan)is an antagonist to the opioid receptor,the same receptor to which heroin is an agonist.If both heroin and naloxone were in the bloodstream,what would the user experience?

A)A decrease in the effects of heroin
B)An increase in the effects of heroin
C)The same effects from heroin plus additional effects of naloxone
D)A new set of effects unlike those of heroin alone