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': 'The amount of total polyamines and putrescine is higher in the following conditions \nSelect and explain. \nA. Necrotic pulps of teeth that are painful to percussion or with spontaneous pain, B. Vital pulps of teeth that are asymptomatic, C. Pulps of teeth that have chronic hyperplastic pulpitis, D. Pulp associated with an impacted tooth', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]