Use the Following to Answer Questions

Multiple Choice

Use the following to answer questions
Scenario I
Tyler is physically dependent on heroin and uses it intravenously multiple times per day.Most often,he uses with his dealer in a drug house on his street.One day when his dealer was out of town,Tyler met a group of fellow users going to a drug party about 2 hours away.Tyler tagged along,and noted that he felt odd injecting the drug in this setting,because the new people and environment was a marked departure from his usual routine.Minutes later,although the drug was of the same quality and he took no more or less than he usually did,Tyler overdosed and had to be rushed to the emergency room.
-(Scenario I) Several decades ago,the psychologist Sheppard Siegel first noted the role that classical conditioning plays in drug overdose.In this model,the unconditioned stimulus in the scenario is _____ and the conditioned stimulus is _____.

A) heroin;the new environment
B) heroin;the usual drug-taking environment
C) the new environment;heroin
D) the usual drug-taking environment;heroin