The learned response to a conditioned stimulus is: D. CR.
<h3>What is 
classical conditioning?</h3>
Classical conditioning can be defined as a learning process which typically involves repeatedly pairing two stimuli, which include the following:
In classical conditioning, a response which is at first brought forth by the second stimulus would later be brought forth by the first stimulus alone.
This ultimately implies that, classical conditioning is a process through which a living organism can learn how to associate stimuli and as a result anticipating events. 
In this context, we can infer and logically deuce that the learned response to a conditioned stimulus is conditioned response (CR).
Read more on conditioned response here: brainly.com/question/24868138
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Nursing is the correct answer kourtney