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: Pediatrics
[{'content': 'Most common secondary tumor with Retinoblastoma is \nSelect and explain. \nA. Neuroblastoma, B. Pineoblastoma, C. Osteochondroma, D. Osteosarcoma', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Most common secondary tumor with Retinoblastoma\xa0Osteosarcoma, Soft tissue sarcoma and malignant melanoma.', 'role': 'assistant'}]