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': 'Stunned pulp means \nSelect and explain. \nA. Stunning appearance on radiograph, B. Pulp not capable of positive response to tooth vitality tests for 6-8 weeks after injury, C. Necrotic pulp, D. Normal pulp', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]