Ian loved getting hamburgers at Bailey's. One day, after contracting a stomach virus, he went to Bailey's to get the hamburger he normally loved. That afternoon, he began feeling nauseous, having stomach pains, and vomiting. Now, every time Ian tries to enjoy the hamburger he used to love, he feels nauseous. Which of the following was the unconditioned stimulus? 

Stomach virus 

Nausea Bailey's 

hamburger 

None of the above

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