Final answer:
Charity's nausea at the sight of potatoes after falling ill from potato salad is known as taste aversion, which is a conditioned response where the body associates food with sickness.
Step-by-step explanation:
The sick feeling Charity experiences when she sees potatoes in the grocery store after her illness is an example of taste aversion. This is a type of conditioning where an association is made between a food that has caused illness and subsequent negative reactions to that food.
This aversion can even occur with a significant time gap between eating the food and experiencing the illness. Charity's experience with potato salad led to her body associating potatoes with sickness, thereby triggering a conditioned response of nausea at the sight of them.