Which Is Not Involved in the Process of Bone Repair

Which is not involved in the process of bone repair following a fracture?

A) Fibroblasts produce collagen fibers to connect broken pieces of bone.
B) A fibrocartilaginous callus serves as a model for new bone growth.
C) Osteoclasts remove excess bone from the hard callus.
D) The fracture hematoma reorganizes to form a procallus.
E) No exceptions; all of the choices are involved in the process of bone repair.