You find a male patient with obvious difficulty breathing. He is using his neck muscles, and is cyanotic. There are red blotches on his chest, and his neck is swelling. You suspect :

Answer & Explanation

The correct answer is Option A: Anaphylaxis..

The combination of respiratory distress, cyanosis, and swelling of the neck/face is characteristic of a severe allergic reaction (anaphylaxis) due to upper airway obstruction and edema.