This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vitreous and retina, Subject name: Ophthalmology
[{'content': 'Most common malignant orbital tumour in children is \nSelect and explain. \nA. AML, B. ALL, C. Rhabdomyosarcoma, D. Cavernous hemangioma', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]