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': 'Most common cause of unilateral proptosis in children is \nSelect and explain. \nA. Thyroid ophthalmopathy, B. Orbital cellulitis, C. Chloroma, D. Neuroblastoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: M/C cause in children - Orbital cellulitis.\nM/C\xa0cause in adults - Thyroid ophthalmopathy.', 'role': 'assistant'}]