Answer:
Pen color; Liking for pen
Explanation:
Condition stimulus and condition response has its origin in conditioning.
Conditioning is simply defined as a Type of learning process that entails a stimulus based response connections.
Classical conditioning
As a method of learning involves a situation where one stimulus calls forth the response usually called by another stimulus.
Conditioned response (CR)
Is a type of response that is Learned. It is a response that is learned to a stimulus that was previously neutral or meaningless. It is simply a learned reflexive response, to a former neutral stimulus. E.g. Dog's salivation to sound of a bell.
Conditioned stimulus (CS)
Is simply defined as a neutral stimulus before,that due to its pairing with an unconditioned response, now leads to a conditioned response. It is a known stimulus that is neutral in nature but usually appears to show a reflexive response. Example is Sound of bell.