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: Pathology
[{'content': 'pumping action is shown by: \nSelect and explain. \nA. Central hemangioma, B. Peripheral hemangioma., C. Central giant cell granuloma., D. All of the above.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: pumping action is if the tooth in the tumor area is pushed into the socket,it is rebound back', 'role': 'assistant'}]