This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Dental
[{'content': 'Systemic factor which is responsible for bone remodeling : \nSelect and explain. \nA. IL-1,IL-6., B. TGF b., C. PGE2., D. PTH.', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Regulatory Factors in Bone Remodelling', 'role': 'assistant'}]