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': 'Endodontically treated posterior teeth are more susceptible to fracture than untreated posterior teeth. The best explanation for this is: \nSelect and explain. \nA. Moisture loss, B. Loss of root vitality, C. Plastic deformation of dentin, D. Destruction of the coronal architecture', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]