Which of the following best illustrates the concept of craving?
A) A man ingests an aspirin to rid himself of a strong headache.
B) A hungry rat presses a lever to obtain a food pellet.
C) A rat presses a lever that results in delivery of shock through the floor of the chamber.
D) A woman injects heroin into her veins to obtain a "rush."
E) A "free" injection of cocaine reinstates responding for intravenous cocaine in a rat that previously underwent extinction of cocaine responding.
Answer: E
Rationale: An example of the concept of craving is when "free" injection of cocaine reinstates responding for intravenous cocaine in a rat that previously underwent extinction of cocaine responding.
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