A customer finds a piece of glass in their salad. This is an example of:

解析

A foreign object such as glass, a metal shaving, a bandage, or a bone is physical contamination. Managers control it by keeping equipment and light shields in repair, never using glassware to scoop ice, and inspecting produce. Biological contamination means a living pathogen, chemical contamination means a cleaner, pesticide, or toxic metal, and allergen cross-contact means an allergen protein moved into a food that should not contain it; a glass shard is none of those. Every option names a genuine control, so the question is only which hazard category the glass falls into.