Answer the following question given this paragraph: 

Bones consist of four different types of tissue: periosteum, compact bone, spongy bone, and bone marrow. Ossification gradually changes the cartilage skeleton of the fetus to the bony skeleton of the adult.


Q: Bones consist of four types of tissue, compact bone, spongy bone, bone marrow, and what?

 Choices:

- collagen

- epithelium

- plasma

- periosteum

A:
periosteum
