Simon cringes every time he hears a dentist’s drill, even when he is sitting in the waiting room of his dentist’s office. in this example, cringing in the waiting room is:
a) a conditioned responseb) an un-conditioned stimulusc) an un-conditioned responsed) a conditioned stimulus

A) A conditioned response.

Explanation:

According to the classical conditioning theory, a condition response is obtained by pairing an unconditioned stimulus and conditioned stimulus. When the pairing of the unconditioned stimulus and conditioned stimulus is performed in close proximity it results in conditioned response. Dentist's drills is an unconditioned stimulus that results in Simon's cringe and later the sound of this drill become conditioned response, resulted  in Simon's cringe even not in the presence of the dentist is the conditioned response.