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': 'Which of the following are efficient methods of managing interproximal soft tissues while making elastic impression \nSelect and explain. \nA. Rubber dam, B. Use of chemically impregnated cord, C. Etectro surgery, D. All of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]