Answer:
the smell or taste of tequila; nausea
Explanation:
In classical conditioning, the conditioned stimulus is a previously neutral stimulus that initially, do not elicit a response until after being paired with a natural stimulus to elicit same response, while the response that is now being elicited by the previously neutral stimulus, is the conditioned response.
From the question above, <em>we can infer that the smell or taste of tequila</em>, ordinary will not cause nausea, is the <em>previously neutral stimulus (conditioned stimulus)</em> that has now become associated with a natural stimulus or unconditioned stimulus, which is drinking heavily. Drinking heavily, is an unconditioned stimulus that can naturally elicit vomiting, which is an unconditioned response. <em>The nausea caused by the smell or taste of tequila is referred to as the conditioned response.</em>
The conditioned stimulus is the smell or taste of tequila, and the conditioned response is the nausea.