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  D. No exceptions; all of the choices are involved in the process of bone repair

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