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': 'Dry socket \nSelect and explain. \nA. Results from loss of blood clot in the socket, B. Is treated with reinducing bleeding into the socket, C. Is a form of osteomyelitis, D. Is common in extraction of anterior teeth', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]