What type of cell carries oxygen to the pulp of a tooth?

The correct choice indicates that endothelium cells play a crucial role in transporting oxygen to the pulp of a tooth. Endothelium cells line blood vessels and are vital for maintaining vascular health. They form the barrier between the blood and the tissues, including the dental pulp.

In the context of a tooth, the pulp contains blood vessels that supply oxygen and nutrients necessary for the vitality of the tooth. Endothelial cells form part of these blood vessels and are responsible for ensuring that oxygen-rich blood reaches the pulp, which is essential for its metabolic activities, survival, and overall health.

The other cell types mentioned do not serve this specific function. Fibroblast cells primarily involved in the synthesis of extracellular matrix and collagen in connective tissues are crucial for the structural integrity of the tooth but do not carry oxygen. Osteoblast cells are responsible for bone formation and are more associated with the dental alveolus rather than directly with oxygen transport to the pulp. Chondrocyte cells are found in cartilage and are not present in the dental pulp or involved in its oxygen supply.