This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Regional injuries, Subject name: Forensic Medicine
Battle sign is positive if bruise is present in 
Select and explain. 
A. Orbital region, B. Occipital region, C. Mastoid region, D. Neck region
C: Mastoid region
Answer: C: Mastoid region 
Explanation: Battle's sign: Bruising/ecchymosis over the mastoid process in the line of posterior auricular aery. It is an indication of fracture of middle cranial fossa of the skull, and may suggest underlying brain trauma