What signs and symptoms indicate anaphylaxis that requires EMS intervention?

• A. Slow onset mild itchiness with no airway symptoms.
• B. Rapid onset swelling of face and tongue, airway constriction with wheezing or stridor, hives or flushing, vomiting, hypotension, and dizziness.
• C. Chest pain only.
• D. Rash on a leg.

Answer: (B)