This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.N.S., Subject name: Medicine
[{'content': 'IOC for diffuse axonal injury is - \nSelect and explain. \nA. Radiograph, B. CT Scan, C. MRI, D. PET Scan', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., MRI Diffuse Axonal Injury* A special type of deep white matter lesion consists of widespread mechanical disruption, or shearing, of axons at the time of impact.* Most characteristic are small areas of tissue injury in the corpus callosum and dorsolateral pons.* This presence of widespread axonal damage in both hemispheres is called diffuse axonal injury (DAI).* It has been proposed to explain persistent coma and the vegetative state after closed head injury.* Only severe shearing lesions that contain blood are visualized by CT, usually in the corpus callosum and centrum semiovale; however, selective imaging sequences of the MRI can demonstrate such lesions throughout the white matter. Thus MRI is considered the investigation of choice for diffuse axonal injury.", 'role': 'assistant'}]