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': 'The most common histopathological type of malignant melanoma of choroid is: \nSelect and explain. \nA. Spindle - A cell, B. Spindle-B cell, C. Epitheloid cell, D. Mixed cell', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. Mixed cell', 'role': 'assistant'}]