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: Surgery
[{'content': "When instead of interdental bone, adjacent tooth is used as Fulcrum, this is seen in: \nSelect and explain. \nA. Stobie's extraction., B. Wilkinson extraction., C. Serial extraction., D. Balancing extraction.", 'role': 'user'}, {'content': "Answer: A \nExplanation: In Stobie's extraction two teeth are luxated simultaneously.", 'role': 'assistant'}]