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': 'Rees-Elswoh classification is used for: \nSelect and explain. \nA. BCC eyelid, B. Melanoma of choroid, C. Retinoblastoma, D. Hepatoblastoma', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Retinoblastoma', 'role': 'assistant'}]