A person eats a hamburger at a restaurant and develops a very bad stomachache after finishing eating. As a result of the sudden illness, the person cannot eat hamburgers anymore. Just thinking about them makes the person feel sick to the stomach. In this scenario, the thought of a hamburger is unconditioned stimulus. unconditioned stimulus., unconditioned stimulus. unconditioned stimulus., conditioned response. conditioned response., conditioned response. conditioned response., conditioned stimulus.

Explanation: A type of learning that occurs as a result of an association between an environmental stimulus and a naturally occurring stimulus is known as classical conditioning.

In classical conditioning there are different types of stimulus - one of them is an unconditional stimulus and the other is a conditional stimulus.

an unconditional stimulus is the one that occurs naturally and generates a response whereas a conditional stimulus is a neutral stimulus that gets associated with an unconditional stimulus and then generates a response.

In the given situation, seeing and eating the hamburger was a neutral stimulus for the person however once he develops a bad stomach, he associates this with an unconditioned stimulus and thus, whenever he sees it he feels sick to the stomach and hence, the hamburger here is a conditional stimulus.