This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neuroradiology, Subject name: Radiology
[{'content': 'T1W MRI of the orbit is shown below, probable diagnosis? \nSelect and explain. \nA. Melanoma, B. Retinoblastoma, C. Optic Glioma, D. Meningioma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Melanin is T1 hyperintense Lentiform homogenously hyperintense lesion on T1W MRI in adults - Choroidal Melanoma Isointense/ Slightly hyperintense lesion on T1W - MRI in children with intraorbital calcificaitns - Retinoblastoma.', 'role': 'assistant'}]