Answer :
Answer:conditioned stimulus
Explanation:In classical conditioning, the conditioned stimulus is a stimulus which doesn't occur automatically or natural but it has been learned due to the fact that it has been associated with an unconditioned stimulus.
Conditioned stimulus is a previously neutral stimulus which over time becomes a conditioned stimulus due to its association with an unconditioned stimulus .
For example Pavlov makes an example of whistling when one calls a dog for food , whistling is a neutral stimulus , that connects a dog with its food, over time a dog will start to salivate or drool when it hears a whistle just as it does when it sees it food , why? Because it has associated whistling with food (food being an unconditioned stimulus)