A guest who ate a dessert begins wheezing, her lips swell, and she says her throat feels tight. What should staff do first?

解析

Swelling, wheezing, and throat tightness are signs of anaphylaxis, which can become fatal within minutes, so the first action is to call emergency medical services and stay with the guest. Checking the recipe, offering water, or moving her outside all delay the only response that matters.