Five years ago, Lee drank some milkshake and then went on a roller-coaster ride in an amusement park. After a while, he got sick and started vomiting. Even now, Lee refuses to drink milkshakes because every time he drinks one, he feels nauseous. In this learned association, the milkshake serves as a(n) ________ for Lee.
A. unconditioned stimulus
B. conditioned stimulus
C. unconditioned response
D. conditioned response
Answer: B
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