The infant albert developed a fear of rats after a white rat was associated with a loud noise. in this example, fear of the white rat was the:

The fear of the rat was the conditioned response (CR) in this case.

A conditioned response (CR) is a process involved in classical conditioning. A CR refers to a response by an animal or human being, after they associate a situation or experience with a neutral stimulus. After repeated pairing of a neutral stimulus with a certain experience, the neutral stimulus evokes a response in a human or animal.