This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Forensic Medicine
A bullet with an unsteady trajectory during flight is known as? 
Select and explain. 
A. Souvenir bullet, B. Yawning bullet, C. Frangible bullet, D. Incendiary bullet
B: Yawning bullet
Answer: B: Yawning bullet 
Explanation: Souvenir bullet remains in the live victim long after the gunshot injury without any deleterious effect. Frangible bullets are designed to fragment on impact. Incendiary bullet contains phosphorous which burns on firing. Ref: Textbook of Forensic Medicine and Toxicology By V.V Pillay, 15th Edition, Pages 211-12