Conditioned taste aversion is the only type of conditioning that only needs one exposure. It does not need to be the specific food or drinks that cause the taste. Conditioned taste aversion can also be attributed to extenuating circumstances. An example of this can be eating a rotten apple. Eating the apple and then immediately throwing up. Now it is hard to even be near an apple without feeling sick. Conditioned taste aversion can also come about by the mere associations of two stimuli. Eating a peanut butter and jelly sandwich, but also having the flu. Eating the sandwich makes one feel nauseous, so one throws up, now one cannot smell peanut butter without feeling queasy. Though eating the sandwich does not cause one to through up, they are still linked.