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': 'False positive Electric Pulp Test is due to all except \nSelect and explain. \nA. Anxiety, B. Liquefactive necrosis of pulp, C. Pain killer last night, D. Tooth wet by saliva and surrounding tissues', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]