Bronchi or windpipe?

• A. Palat/o
• B. Sphygm/o
• C. Bronch/o
• D. Eryth/o

Answer: (C)

The main idea here is identifying the combining form that means the bronchi, the air passages that branch from the trachea into the lungs. The combining form for bronchus/bronchi is bronch/o. It’s used to form terms like bronchitis or bronchial, and it specifically refers to the airways inside the lungs. The windpipe, by contrast, is the trachea, which uses the combining form trache/o (as in trachea or tracheostomy), not bronch/o. The singular term is bronchus, with bronchi being the plural. The other roots here don’t relate to the airways: palat/o means palate, sphygm/o means pulse, and eryth/o means red (as in erythrocyte).