system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Following a fracture of the humerus, which of the following is responsible for producing the majority of the new bone that will reunite the two fragments?
assistant
The correct answer is  When the periosteum is torn during a fracture, it supplies cells that develop into osteoblasts and are the major producers of the new bone that reunites the two ends.