Which of the following terms refers to the lower extremities on both sides of the body?

The term that refers to the lower extremities on both sides of the body is "Bilateral Lower Extremities." This expression indicates that the focus is on both legs, or lower limbs, as they exist on the left and right sides of the body. The prefix "bi-" signifies "two" or "both," thus indicating that it encompasses both lower limbs together.

This terminology is commonly used in medical and anatomical contexts to describe conditions, treatments, or assessments that involve both legs simultaneously. In contrast, the terms referencing upper extremities would pertain to the arms and hands, which is why options related to upper extremities or unilateral (meaning one-sided) do not apply in this context. The choice related to lower body extremities, while closely situated, lacks the specificity regarding the bilateral aspect, which is critical for accurate terminology in medical language.