This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cerebrovascular, Subject name: Medicine
[{'content': 'A patient presented with contralateral hemiplegia and sub-periosteal bleeding. Which of the following will be the initial investigation of choice? \nSelect and explain. \nA. Chest x-ray, B. CT-scan, C. MRI, D. PET - scan', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) CT-scanRef: Harrison 19th ed. / 2582* For evaluation of bleeding in the brain the preferred investigation is CT scan. The bleeding in the brain shows up as hyper-density on CT scan.', 'role': 'assistant'}]