Physical hazards are foreign objects inadvertently introduced into food during production or handling. Examples include hair, glass, metal, and stones, which can lead to injury if ingested.Hair is a common physical hazard in food safety, often contaminating food due to inadequate hygiene.Rationale for incorrect options:
(A) Visible biological hazard : Bacteria — Bacteria are biological hazards but are microscopic, not visible to the naked eye.
(B) Invisible microbiological hazard : Worms — Worms are typically visible and are not classified as "invisible microbiological hazards."
(C) Chemical hazard : Bone fragments — Bone fragments are physical hazards, not chemical.