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
Gutter fracture is due to 
Select and explain. 
A. Sharp edged weapon, B. Fire arm injury, C. Blunt weapon, D. Serrated edge
B: Fire arm injury
Answer: B: Fire arm injury 
Explanation: 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