In anatomical terminology, 'posterior' is to _____ as 'anterior' is to _____.

In anatomical terminology, the term 'posterior' refers to the back of the body, while 'anterior' pertains to the front of the body. Therefore, the relationship posed in the question is that if posterior corresponds to the back, then anterior directly corresponds to the front. This aligns perfectly with option A, which articulates these relationships accurately, capturing how these terms are utilized to describe the positioning of structures in relation to one another. Understanding these directional terms is essential in fields such as anatomy, medicine, and fitness, where precise communication regarding body orientation is crucial.