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': 'A patient of head injury, has no relatives and requires urgent cranial decompression, doctor should: \nSelect and explain. \nA. Operate without formal consent, B. Take police consent, C. Wait for relatives to take consent, D. Take magistrate consent', 'role': 'user'}, {'content': "Answer: A \nExplanation: Operate without formal consent is necessary in this case, delay will lead to death of the patient. Ref: Parikh's Textbook of Medical Jurisprudence Forensic Medicine and Toxicology, 5th Edition, Page 569 and 6th Edition, Page 1.37", 'role': 'assistant'}]