Which of the following is a characteristic symptom of anaphylactic shock?

A. Decreased respiratory rate: In anaphylactic shock, respiratory rate is typically increased due to bronchoconstriction and airway compromise, not decreased. B. Angioedema of the lips and tongue: Angioedema is a classic and life-threatening sign of anaphylaxis due to increased capillary permeability. Swelling of the lips, tongue, and airway structures can obstruct breathing. C. High blood pressure: Anaphylaxis causes vasodilation and capillary leakage, leading to hypotension, not hypertension. D. Elevated body temperature: Fever is not a hallmark of anaphylaxis. Elevated temperature is more common in infections or inflammatory responses.