Which combining form means viscera?

• A. Viscer/o
• B. Enter/o
• C. Arthr/o
• D. Nephr/o

Answer: (A)

Viscera means the internal organs, especially those in the chest and abdomen. The combining form viscer/o is the one used to connect to suffixes that describe or modify these organs, so terms built with viscer/o convey something about the internal organs—for example, visceral (pertaining to the viscera) or visceromegaly (enlargement of internal organs). The other roots point to different parts: enter/o is the intestines, arthr/o is a joint, and nephr/o is the kidney. Because the question asks for the root that means viscera, viscer/o is the best fit.