This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous System, Subject name: Radiology
[{'content': "Abnormal signals in bilateral thalami on MRI brain is seen in: \nSelect and explain. \nA. Wilson's disease, B. Japanese encephalitis, C. Wernicke's encephalopathy, D. Rasmussen's encephalitis", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B. Japanese encephalitisExperience with imaging studies is still evolving; clearly, however, both computed tomography (CT) and magnetic resonance imaging (MRI) may be normal, except for evidence of pre-existing conditions, or sometimes may suggest diffuse edema. Several patients with severe Japanese encephalitis have presented with bilateral thalamic lesions that have often been hemorrhagic.', 'role': 'assistant'}]