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': 'Which of the following divisions stand for compromised bone \nSelect and explain. \nA. Division A, B. Division B, C. Division C, D. Division D', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The Division C available bone is deficient in one or more dimensions (height, length, height, angulation, or crown height-bone height ratio).\nTherefore the width may be less than 2.5 mm, the crown height more than 15 mm, and the bone angulation greater than 30 degrees, regardless of the position of the implant body into the edentulous site.', 'role': 'assistant'}]