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': 'Gold standard test for diagnosis of acoustic neuroma: \nSelect and explain. \nA. CT with contrast, B. MRI with contrast, C. CT without contrast, D. Angiography', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. MRI with contrast', 'role': 'assistant'}]