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 intraocular tumour in adult: \nSelect and explain. \nA. Metastasis, B. Retinoblastoma, C. Malignant melanoma, D. Vitreous tumour', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Metastasis', 'role': 'assistant'}]