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: Radiology
[{'content': 'IOC for subarachnoid hemorrhage: September 2011 \nSelect and explain. \nA. MRI, B. NCCT, C. USG, D. X-ray skull', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B: NCCT Radiological signs in CNS: Bracket calcification: Corpus callosum lipoma (skull) Basal ganglia calcification: Hypoparathyroidism Suprasellar calcification: - Craniopharyngioma - Meningioma Rail road/ Tram track calcification: Sturge Weber syndrome Periventricular calcification: CMV infections Separation of sutures: Sign of raised intracranial tension in a child', 'role': 'assistant'}]