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': 'The most common cause of bilateral proptosis in children is: \nSelect and explain. \nA. Cavernous hemangioma, B. Fibrous Histiocytoma, C. Chloroma, D. Rhabdomyosarcoma', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The most common cause of bilateral proptosis in children is not definitively established, but metastatic neuroblastoma and/or leukemia should be considered. Common causes of bilateral proptosis in children are congenital skeletal deformities followed by lymphoma, leukemia and other lymphoproliferative disorders. Chloroma is a solid tumor consisting of myeloid leukemic blasts. Of all the options given it is the best answer. Ref: The Massachusetts Eye and Ear Infirmary review manual for Ophthalmology - Page 186; Surgical Atlas of Orbital Diseases - Page 52.', 'role': 'assistant'}]