A piece of plastic found in yogurt represents which type of hazard?

A piece of plastic found in yogurt represents a physical hazard. Physical hazards in food are any foreign objects that can inadvertently become part of the food product and pose a risk to consumers. These can include items such as glass, plastic, metal fragments, and stones. The presence of any such foreign materials can cause injury, choking, or other health risks when ingested.

In this case, the plastic is not a biological agent (such as bacteria or viruses) that could cause foodborne illness, nor is it a chemical substance that could lead to chemical contamination. Additionally, ergonomic hazards relate to the design of the work environment and how it affects human physical factors, which does not apply to the situation of finding plastic in food. Therefore, identifying plastic in yogurt as a physical hazard accurately reflects the nature of the risk presented.