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
[{'content': 'Presence of spiral grooves in the barrel of weapon is referred to as - \nSelect and explain. \nA. Rifling, B. Incendiary, C. Cocking, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The synopsis of forensic medicine & toxicology ; Dr k.s narayan reddy ; 28th edition ; pg.no 123 & 124 The bore is cut internally with number of shallow ,spiral " grooves" varying from two to more than twenty ,the most common being six ,which run parallel to each other but twisted spirally ,from breech to muzzle . The groove are called rifling and the projecting ridges between these grooves are called "lands".', 'role': 'assistant'}]