This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diseases of orbit, Lids and lacrimal apparatus, Subject name: Ophthalmology
[{'content': 'Most common orbital tumors in children is \nSelect and explain. \nA. Retinoblastoma, B. Rhabdomyosarcoma, C. Melanoma, D. Chloroma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Rhabdomyosarcoma is a tumor arising from the pleuripotential mesenchymal cells which later develops in striated muscle Refer khurana 6/e', 'role': 'assistant'}]