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': 'Second common malignancy in Patients of Retinoblastoma is: \nSelect and explain. \nA. Osteoblastoma, B. Osteochondroma, C. Osteoclastoma, D. Osteosarcoma', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Osteosarcoma', 'role': 'assistant'}]