The word that should fill the blank is: Taste Aversion.
So, Rita is fine, but Dimitri has developed a Taste Aversion, because a week later when they stop for donuts, Dimitri immediately feels ill.
A taste aversion is the feeling that comes with avoiding a meal because it makes the individual sick.
Dimitri consumed the same food that Rita had but the food made him fall ill. This means that he has developed a taste aversion for douts.
Learn more about taste aversion here:
https://brainly.com/question/26193362