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': 'Prior to reimplantation tooth is soaked in 3% citric acid this is done to \nSelect and explain. \nA. Disinfect the tooth, B. Remove the PDL, C. Etch the surface, D. Increase surface reactivity', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]