This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Intra Ocular Tumour, Subject name: Ophthalmology
[{'content': 'Most common eye ball tumour is \nSelect and explain. \nA. Retinblastoma, B. Sarcoma, C. Medulloblastoma, D. Malignant', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' ie Retinoblastoma Retinoblastoma is the most common primary malignant intraocular tumour of childhood and the second most common of all age groups.MC primary malignant intraocular tumour of adults - Choroid melanoma*", 'role': 'assistant'}]