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': 'Battles sign is extopic manifestation of? \nSelect and explain. \nA. Anterior cranial fossa fracture, B. Middle cranial fossa fracture, C. Posterior cranial fossa fracture, D. Orbital fracture', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ecchymosis over the mastoid procens following fracture of middle cranial fossa is called Battles sign.', 'role': 'assistant'}]