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': "Champy's plates are? \nSelect and explain. \nA. Semirigid fixation with monocortical screws, B. Semirigid fixation with bicortical screws, C. Rigid fixation with bicortical screws, D. Rigid fixation with monocortical screws", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]