Laura has an allergy to shellfish and tree nuts. If she experiences swelling of the face, hives, and trouble breathing, what might she have ingested?

Laura might have ingested lobster, which is shellfish. While all of the answers represent allergens from the “Big 9,” only lobster falls into the category of either shellfish or tree nuts. Examples of tree nuts include cashews, Brazil nuts, almonds, and walnuts. Examples of shellfish include shrimp, crab, and mollusks. Peanuts are not to be confused with tree nuts, as they are a legume.