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 is a technique of border moulding? \nSelect and explain. \nA. Single-step technique., B. Simultaneous border moulding., C. Incremental border moulding., D. All of the above.', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]