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
When instead of interdental bone, adjacent tooth is used as Fulcrum, this is seen in: 
Select and explain. 
A. Stobie's extraction., B. Wilkinson extraction., C. Serial extraction., D. Balancing extraction.
A: Stobie's extraction.
Answer: A: Stobie's extraction. 
Explanation: In Stobie's extraction two teeth are luxated simultaneously.