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': 'Ideal treatment of B/L retinoblastoma- \nSelect and explain. \nA. Enucleation, B. Radiation, C. Chemotherapy, D. Cyclophotocoagulation', 'role': 'user'}, {'content': 'Answer: B \nExplanation: *Chemotherapy is now the first line of treatment of choice in most cases of bilateral retinoblastoma. Ref: Wills Eye Hospital at las of Clinical ophthalmology p.269.', 'role': 'assistant'}]