Which of the following terms refers to the rib in medical terminology?

The term "costo" is derived from the Latin word "costa," which means rib. In medical terminology, it is commonly used as a prefix in various terms related to the ribs. For example, "costochondritis" refers to inflammation of the cartilage connecting the ribs to the sternum, and "costovertebral" pertains to the joint between a rib and a vertebra.

The other terms do not specifically refer to the rib in the same way. "Cost" can refer to price in a general context but does not have the same specific medical connotation as "costo." "Ribo" is not a recognized term in medical terminology related to ribs; instead, it may be confused with terms related to ribonucleic acid (RNA) in biology. "Thorac" refers generally to the thorax or chest area and does not specifically denote a rib. Thus, "costo" is clearly the appropriate term for referring to a rib in medical terminology.