to rid the body of wastes to expel food that has no nutritional value to empty the stomach when it has too much food in it to remove toxic material from the stomach before it is absorbed
I gave my students this multiple choice question: Which of these is the main function of the vomiting reflex?

Only one answer is correct among these 4 choices:
- to rid the body of wastes
- to expel food that has no nutritional value
- to empty the stomach when it has too much food in it
- to remove toxic material from the stomach before it is absorbed

Could you tell me which one is correct?

to remove toxic material from the stomach before it is absorbed