Stanley was diagnosed with lymphoma and had to undergo sever…
Stanley was diagnosed with lymphoma and had to undergo several months of chemotherapy. During this time he would become very nauseated as a side effect, and unintentionally came to associate that nausea with his favorite grilled cheese sandwich. Now, years later, even thinking about a grilled cheese sandwich makes him sick. In this example, Stanley's nauseous reaction to a grilled cheese sandwich is the ________.