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': 'MC intraocular malignant tumour of childhood: March 2013 \nSelect and explain. \nA. Malignant melanoma, B. Retinoblastoma, C. Basal cell carcinoma, D. Naevus of iris', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B i.e. Retinoblastoma', 'role': 'assistant'}]