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
A patient of head injury has no relatives & requires urgent cranial decompression; Doctor should - 
Select and explain. 
A. Operate without formal consent, B. Take police consent, C. Wait for relatives to take consent, D. Take magistrate consent
A: Operate without formal consent
Answer: A: Operate without formal consent 
Explanation: For emergency life surgery, when relatives are not there, no consent is required.