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': 'A severe blow to a permanent anterior tooth not\nresulting in fracture, commonly leads to \nSelect and explain. \nA. Pulpal death in the absence of treatment, B. Death of pulp despite treatment, C. Fracture of involved bone, D. Mobility of central incisors', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]