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: Pathology
[{'content': 'In Cleidocranial dysostosis, sometimes the roots of the permanent teeth are \nSelect and explain. \nA. Thin and Long, B. Thin and short, C. Thick and short, D. Fused', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]