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 cause of bilateral proptosis in children- \nSelect and explain. \nA. Rhabdomyosarcoma, B. Neuroblastoma, C. Retinoblastoma, D. Neuroblastoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Common cause of proptosis in children is neuroblastoma and leukemia (chloroma) and in adults is thyroid ophthalmopathy. Ref. Ak khurana 6th edition pg no 404 QUESTION REPEATED', 'role': 'assistant'}]