In classical conditioning, the unconditioned stimulus is:
A) the stimulus that triggers a response after being paired with a conditioned stimulus.
B) the stimulus that triggers a conditioned response.
C) the stimulus that triggers a response after being paired with another stimulus.
D) the stimulus that triggers a response without learning having taken place.
Answer: D
Rationale: An unconditioned stimulus (US) is a stimulus that elicits a reflexive response without learning. The reflexive response to an US is known as an unconditioned response (UR).
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