Considering the situation described above, the unconditioned response is Nausea.
This is because an unconditioned response is an action or response done naturally as a response or reaction.
The unconditioned response is generally an unlearned response that happens to the unconditioned stimulus.
Given that Susan feels nauseous when she walks into the doctor’s office, the unconditioned response is nausea.
Hence, in this case, it is concluded that the correct answer is "nausea."
Learn more about the unconditioned response here: https://brainly.com/question/19540956
