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
[{'content': "Battle's sign is:TN 11 \nSelect and explain. \nA. Hemorrhage around eyes, B. Mastoid ecchymosis, C. Umbilical ecchymosis, D. Vaginal ecchymosis", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Mastoid ecchymosis', 'role': 'assistant'}]