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': 'All of the following childhood tumours cause proptosis except: September 2009 \nSelect and explain. \nA. Retinoblastoma, B. Metastatic neuroblastoma, C. Rhabdomyosarcoma, D. Leukemia', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. A: Retinoblastoma Causes of proptosis in children are: Orbital cellulitis Leukemia Optic nerve+-optic chiasm glioma Orbital rhabdomyosarcoma Metastatic neuroblastoma Plexiform neurofibromatosis Orbital haemangioma Metastatic Ewing's sarcoma Orbital dermoid cyst Lymphangiomas In adults the causes of proptosis are: Metastases from the breast, lung and GIT Cavernous hemangioma Mucoceles Lacrimal gland tumours Lymphoid tumours Meningiomas", 'role': 'assistant'}]