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The bronchi are small tubes that connect the lungs to the trachea, or windpipe. These tubes are lined with smooth muscle and cilia, which help to keep the airway open and prevent choking. The epiglottis is a flap of tissue that covers the opening of the windpipe, the trachea, during swallowing. This helps to prevent food or liquids from entering the airway. Although both of these structures play important roles in preventing choking, they are not directly involved in the process. The larynx, also known as the voice box, is responsible for producing sound and allows for the passage of air between the pharynx and trachea. Similarly, the trachea is also involved in conducting air from the nose and mouth to the lungs, but it is not directly responsible for preventing choking. Therefore, the correct answer is the bronchi.