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': 'Calcification is pathognomonic feature of – \nSelect and explain. \nA. Malignant melanoma of choroid, B. Retinocytoma, C. Retinoblastoma, D. Angiomatosis retinae', 'role': 'user'}, {'content': 'Answer: C \nExplanation: In retinoblastoma, there are areas of necrosis and calcification.', 'role': 'assistant'}]