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': 'When hot nail is placed on vital tooth surface \nSelect and explain. \nA. There is increase in intrapulpal pressure followed by decrease to above normal, B. There is increase in intrapulpal pressure followed by decrease to normal, C. There is increase in intrapulpal pressure followed by decrease to below normal, D. There is increase in intrapulpal volume without any increase in intrapulpal pressure', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]