This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Special topics, Subject name: Forensic Medicine
[{'content': 'Gutter fracture is due to \nSelect and explain. \nA. Sharp edged weapon, B. Fire arm injury, C. Blunt weapon, D. Serrated edge', 'role': 'user'}, {'content': "Answer: B \nExplanation: Bullet striking on the skull but not entering it: Bullet may tangentially touch the skull and doesn't enter the skull cavity . In such a case , there may be a gutter that is produced on the skull- Gutter fracture ref: FORENSIC MEDICINE AND TOXICOLOGY DR PC IGNATIUS THIRD EDITION PAGE 154", 'role': 'assistant'}]