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': 'All of the following show false negative result on EPT (electric pulp testing) except: \nSelect and explain. \nA. Teeth with calcified canal, B. Immature teeth, C. Sedated patient, either alcohol or drugs, D. Moist gangrenous pulp', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]