Choose the word which is different from the rest.

The answer is C. Auricle.

The pharynx, bronchiole, and alveoli are all parts of the respiratory system. The pharynx is a muscular tube that connects the mouth and nose to the larynx. The bronchiole is a small airway that branches off from the bronchus and leads to the alveoli. The alveoli are tiny air sacs in the lungs where gas exchange takes place.

The auricle is a part of the ear. It is the external part of the ear that is visible on the side of the head. The auricle helps to collect sound waves and directs them to the ear canal.

The pharynx, bronchiole, and alveoli are all necessary for breathing. The auricle is not necessary for breathing.