What is the correct combining form for the term related to the mouth?

The combining form "or/o" is the correct choice for terms related to the mouth. In medical terminology, combining forms are used to create terms and describe various anatomical structures and conditions.

In this case, "or/o" specifically refers to oral structures, such as in the terms "oral cavity," "oropharynx," and "oral hygiene," which relate directly to the mouth and its functions. This combining form is integral in the formulation of words in both clinical and general medical contexts associated with the mouth.

The other options represent different anatomical areas or systems: "col/o" pertains to the colon; "gynec/o" relates to the female reproductive system; and "neur/o" is associated with the nervous system. Understanding these combining forms helps in grasping other medical terms and their meanings within the scope of the health sciences.