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': 'Commonest intraocular tumour in children is: \nSelect and explain. \nA. Retinoblastoma, B. Malignant melanoma, C. Teratoma, D. Neuroblastoma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Retinoblastoma', 'role': 'assistant'}]