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': 'Battle sign - \nSelect and explain. \nA. Periorbital ecchymosis, B. Mastoid bleed, C. Nose bleed, D. Bleed from tympanic membrane', 'role': 'user'}, {'content': "Answer: B \nExplanation: The synopsis of forensic medicine & toxicology;Dr k .s narayan reddy; 28th edition; pg.no. 107; A bruise behind the ear may indicate a basal fracture rather than a direct blow behind the ear .(BATTLE 'S SIGN) It is an example of ectopic bruising or percolated contusion.", 'role': 'assistant'}]