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 one of the following is not seen in the acute irreverisible pulpitis: \nSelect and explain. \nA. Pain disappears on removal of stimulus, B. Pain persists on removal of stimulus, C. Increased threshold for stimulus, D. Severe pain', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]