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': 'Calibre is defined as - \nSelect and explain. \nA. Distance between two diametrically opposite grooves, B. Distance between two diametrically opposite lands, C. Distance between two diametrically opposite lands and grooves, D. Ratio of the length and width of the barrel', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The synopsis of forensic medicine & toxicology ; Dr k.s narayan reddy ; 28th edition ; Pg.no. 122 It is also called gauge . Also refer fig 8-16 (cross section of a rifled barrel)', 'role': 'assistant'}]