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
[{'content': 'Which of the following is feature of Diffuse axonal injury: September 2010 \nSelect and explain. \nA. No unconsciousness, B. Transient unconsciousness, C. Prolonged unconsciousness, D. None of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C: Prolonged Unconsciousness Diffuse axonal injury (DAI) is one of the most common and devastating types of traumatic brain injury, meaning that damage occurs over a more widespread area than in focal brain injury. DAI, which refers to extensive lesions in white matter tracts, is one of the major causes of unconsciousness and persistent vegetative state after head trauma. It occurs in about half of all cases of severe head trauma and also occurs in moderate and mild brain injury', 'role': 'assistant'}]