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: Ophthalmology
[{'content': 'Intraocular calcification is seen in: March 2013 (a) \nSelect and explain. \nA. Malignant melanoma of the ciliary body, B. Retinoblastoma, C. Malignant melanoma of the choroid, D. Malignant melanoma of the iris', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B i.e. Retinoblastoma', 'role': 'assistant'}]