This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Regional Injuries, Subject name: Forensic Medicine
[{'content': 'Battle sign is positive, if bruise in \nSelect and explain. \nA. Orbital region, B. Occipital region, C. Mastoid region, D. Neck region', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. (C). Mastoid region(Ref: Review of Forensic Medicine & toxicology; Gautum Biswas; 2nd edition; Pg - 236)Bruising/ecchymosis over the mastoid processQ in the line of posterior auricular artery.It is an indication of fracture of middle cranial fossaQof the skull, and may suggest underlying brain trauma', 'role': 'assistant'}]