This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Maxillo Facial Injuries, Subject name: Surgery
[{'content': "Battle's sign is - \nSelect and explain. \nA. Ecchymosis on the mastoid, B. Bledding through the year, C. CSF Rhinorrhoea, D. Periorbital ecchymosis", 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Ecchymosis on the mastoid o Battle's sign (or mastoid echymosis) is bruising or ecchymiosis over the mastoids (i.e. behind the ear). Seen in pterous temporal bone base-of-skull fractureo Raccoon's sign or periorbital ecchymosis is seen in fracture of anterior cranial fossa.", 'role': 'assistant'}]