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
Keyhole bullet entry is a feature of - 
Select and explain. 
A. Tandem bullet, B. Ricochet bullet, C. Single bullet, D. Double bullet
B: Ricochet bullet
Answer: B: Ricochet bullet 
Explanation: the synopsis of forensic medicine & toxicology ; Dr k.s narayan reddy ;28th edition ; pg.no 134 A ricochet bullet is one in which before striking the object aimed at ,strikes some intervening object first then after rebounding from these hits the object. Sometimes a bullet may strike an object & tumble & hit the body side on ,producing an elongated wound of entrance like a keyhole .