Which prefix indicates 'all' or 'entire'?

The prefix "pan-" signifies "all" or "entire." This term is often used in medical terminology to describe conditions that involve the whole body or large systems. For example, "pancreatitis" refers to inflammation of the entire pancreas, indicating that the condition affects the whole organ.

Other prefixes in the choices have specific meanings that don’t relate to the concept of "all" or "entire." "Sym-" generally refers to "together" or "with," indicating things that occur simultaneously or in association with one another. "Epi-" means "upon" or "over" and is used to describe something that is located on the surface of or above another structure. "Hemi-" denotes "half," referring to something that is divided into two equal parts. Therefore, "pan-" stands out as the only choice that correctly conveys the meaning of encompassing everything or being complete.