The combining form "sanguin/o" is specifically related to which bodily fluid?

The combining form "sanguin/o" is derived from the Latin word "sanguis," which means blood. This root is commonly used in medical terminology to refer specifically to blood-related conditions, components, and processes. For instance, terms such as "sanguineous," which describes something that is of or relating to blood, utilize this combining form to clearly convey that the context is associated with blood.

In contrast, the other options reflect entirely different substances or concepts. Oil does not relate to the circulatory or hematological systems, flesh refers to muscle or tissue rather than fluid, and infection pertains to the presence of pathogens and the body's immune responses rather than a specific bodily fluid. Therefore, the association of "sanguin/o" with blood is definitive and establishes a clear connection to hematology and related medical fields.