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': 'Treatment of metastatic disease in retinoblastoma is- \nSelect and explain. \nA. Chemotherapy, B. Enucleation, C. Radiotherapy, D. Cryo', 'role': 'user'}, {'content': 'Answer: A \nExplanation: *Treatment of choice for metastasis is chemotherapy. Ref: Wills Eye Hospital at las of clinical ophthalmology p.269.', 'role': 'assistant'}]