This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Physiology
[{'content': '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? \nSelect and explain. \nA. Cancellous bone, B. Cailage, C. Compact bone, D. Periosteum', 'role': 'user'}, {'content': 'Answer: D \nExplanation: 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.', 'role': 'assistant'}]