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': 'Which of the following are orbital tumours a) Glioma    b) Lymphoma   c) Chloroma  d) Meningioma  e) Schwannoma \nSelect and explain. \nA. abcde, B. abd, C. abc, D. acd', 'role': 'user'}, {'content': "Answer: A \nExplanation: Orbital tumors\nPrimary :- Optic nerve glioma, optic nerve sheat meningioma, cavernous hemangioma, schwannoma, lymphoma.\nSecondary :- Squmous cell carcinoma, malignant melanoma.\nMetastasis :\n\nAdult :- Breast, lung, prostate, kidney, GIT, melanoma.\nChildren :- Neuroblastoma, Ewing's sarcoma, chloroma, wilm's tumor, histiocytosis, testicular embryonal sarcoma, ovarian sarcoma.", 'role': 'assistant'}]