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
The inflicted weapon should be 
Select and explain. 
A. Screw driver, B. Single edged knife, C. Double edged knife, D. Ice pick
C: Double edged knife
Answer: C: Double edged knife 
Explanation: - The stab injury shows acute angles at both ends, which are suggestive of double edged weapon. If a double edged weapon is used, the wound will be elliptical or slit-like and both angles will besharp or pointed. If the knife penetrates to full length up to the guard, one or both edges maybe blunt. - In case of single edged knife wound is wedge shaped sometimes blunt edge of knife can harm the skin giving it a tail like appearance which is known as FISH TAIL. -In case of screwdriver the wound is slit-like with squared ends and abraded margins. - In case of ice pick the wound is circular in shape