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': 'A patient is suspected to have vestibular schwannoma. The investigation of choice for its diagnosis is : \nSelect and explain. \nA. Contrast enhanced CT scan, B. Gadolinium enhanced MRI, C. SPECT, D. PET scan', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Investigation of choice for vestibular schwannoma (acoustic neuroma) is Gd - enhanced MRI.', 'role': 'assistant'}]