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': "'Fracture-ala signature' or signature fracture is - \nSelect and explain. \nA. Gutter fracture & Contre copup injury, B. Depressed fracture of skull, C. Ring fracture at foramen magnum, D. Sutural separation", 'role': 'user'}, {'content': 'Answer: B \nExplanation: The synopsis of forensic medicine &toxicology Dr k.s narayan reddy ;28th edition; pg.no. 140 . Depressed fractures produced by local deformation of skull ,caused by a heavy weapon with small striking surface. These are also called FRACTURE A LA SIGNATURE (SIGNATURE FRACTURE)', 'role': 'assistant'}]