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': 'After the stimulation is removed the response of normal pulp to hot or cold is: \nSelect and explain. \nA. Brief pain, B. Prolonged pain, C. Brief feeling of warmth or cold, D. Prolonged feeling of warmth or cold', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]