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: Surgery
Battle's sign is seen ina) Fracture middle cranial fossab) Fracture base of skullc) Fracture anterior cranial fossad) All of the above 
Select and explain. 
A. ac, B. a, C. ab, D. bc
C: ab
Answer: C: ab 
Explanation: None