This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Tumors, Subject name: Ophthalmology
[{'content': 'The most common primary cause of intraocular tumor in children- \nSelect and explain. \nA. Retinoblastoma, B. Rhabdomyosarcoma, C. Neuroblastoma, D. Melanoma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: *Most common intraocular tumor of childhood is retinoblastoma. Ref:Khurana 7th/e p.314,', 'role': 'assistant'}]