Which of the following is fibrous tissue binding bones together?

The correct choice is fibrous tissue that binds bones together, known as a ligament. Ligaments are strong, flexible bands of connective tissue that connect bones to other bones at joints, providing stability and support while allowing for a certain range of motion. Their primary role is to reinforce joints and help prevent excessive movements that could lead to injuries.

In this context, keloids refer to an overgrowth of scar tissue that forms at the site of a healed skin injury and do not have any function related to binding bones. A joint is the location where two or more bones come together, but it does not itself bind bones; rather, it is the structure that the ligaments support. The lacrimal refers to components related to tear production and drainage in the eye, and is also unrelated to the binding of bones. Thus, ligaments are the specific structures that fulfill the role of binding bones together, making this the correct answer.