Answer: b) tooth
Explanation: A gomphosis is a type of fibrous joint where a conical process fits into a socket and is held in place by a fibrous connection. The most common example of a gomphosis is the connection between a tooth and its socket in the jawbone. This joint is supported by the periodontal ligament, which helps to anchor the tooth securely in place while allowing for slight movement. In contrast, a suture is a type of immovable joint found between the bones of the skull, an interosseous membrane is a type of fibrous joint between long bones (like the radius and ulna), and an intervertebral disc is a cartilaginous joint between adjacent vertebrae. Therefore, the correct answer is option b) tooth.