Which bone is the medial bone of the lower leg?

• A. Fibula
• B. Tibia
• C. Radius
• D. Ulna

Answer: (B)

Identifying which bone sits closest to the body's midline in the lower leg.

The leg has two parallel bones: a larger, weight-bearing bone on the inner side and a thinner bone on the outer side. The inner, weight-bearing bone is positioned toward the midline and forms the main connections at the knee and ankle, bearing most of the body's weight. The outer bone runs along the outside and primarily serves as a site for muscle attachment and ankle stabilization. The remaining two bones are in the forearm, not the leg, so they aren’t relevant here. Therefore, the medial bone of the lower leg is the tibia.