Final answer:
The lingual surface of the mandible, most often in the premolar region, is true as it refers to the internal side of the lower jaw where the premolars are anchored by the alveolar process of the mandible.
Step-by-step explanation:
The lingual surface of the mandible is located on the internal side of the lower jaw, nearest to the tongue (lingual). The statement that references this area being most often in the premolar region is true. The alveolar process of the mandible, which is the upper border of the mandibular body, serves to anchor the lower teeth, including the premolars. Located posterior to the cuspids are the eight premolars, which are used for mashing foods. Thus, the region mentioned is indeed commonly associated with the premolars.