This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Mechanical injuries, Subject name: Forensic Medicine
[{'content': '"Motor cyclist" fracture among the following \nSelect and explain. \nA. Hinge fracture of base of skull, B. Ring fracture of base of skull, C. Depressed fracture of skull, D. Comminuted fracture of skull', 'role': 'user'}, {'content': "Answer: A \nExplanation: Hinge' fracture (Motorcyclist fracture) occurs when the linear fracture passes across the middle cranial fossa, separating the skull base into 2 halves, and may be caused by a heavy blow to the side of the head (e.g. in motorcycle accidents). Ref - Krishnan Vij 5th edition pg 300", 'role': 'assistant'}]