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': 'Enucleation is done for: \nSelect and explain. \nA. Retinoblastoma, B. Malignant melanoma, C. Glaucoma, D. Pthisis bulbi', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. About 20 days', 'role': 'assistant'}]