Atoothpick found in a pizza is an example of what type of contamination

A tooth pick found in a pizza is an example of PHYSICAL CONTAMINATION.
When it comes to food preparation, there are three types of food contamination, these are physical, chemical and biological contamination.
A physical contaminant is anything that is seen in food and is not part of that food. Example of this if hair or toothpick found in food. Chemical contaminants refer to chemicals which are mistakenly added to food while biological contaminants refers to microbes which are introduced into food.

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