Given the task definition and input, reply with output. Given a scientific passage and an answer, generate a question for the given answer.

Passage: Figure 9.3 Intervertebral Disc An intervertebral disc unites the bodies of adjacent vertebrae within the vertebral column. Each disc allows for limited movement between the vertebrae and thus functionally forms an amphiarthrosis type of joint. Intervertebral discs are made of fibrocartilage and thereby structurally form a symphysis type of cartilaginous joint. Answer: fibrocartilage
What are intervertebral discs made of?