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: Forensic Medicine
[{'content': '"Fracture a-Ia signature" is: \nSelect and explain. \nA. A depressed fracture, B. A fissured fracture, C. Separation of the suture, D. A ring fracture', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A depressed fracture', 'role': 'assistant'}]