Connects the sole with the wall?

• A. White line
• B. Horn matrix
• C. Frog
• D. Sole

Answer: (A)

The main idea here is the boundary where the hoof wall meets the sole. The structure that connects them is the white line, the pale seam you see at the inner edge where wall meets sole. It marks the junction of the wall’s keratinized tissue with the sole horn, so it functions as the boundary between these two distinct structures. The horn matrix is the tissue that generates horn growth, not a connector between wall and sole. The frog is a separate structure on the bottom of the hoof that assists with traction and shock absorption, and the sole is the interior bottom surface itself.