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': 'Taurodontism is characterized by: \nSelect and explain. \nA. Hypercementosis, B. Elongated wide pulp canals and short roots, C. Obliterated pulp chambers with secondary dentine deposition, D. Rootless teeth with thin shell of enamel', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]