This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Glaucoma, Subject name: Ophthalmology
[{'content': 'Which of the following is not a system for classification of the angles of the anterior chamber? \nSelect and explain. \nA. Spaeth, B. RPC classification, C. Shaffers system, D. Sun Classification', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Sun classification is for grading of cells and flare in uveitis and not for the angle of the anterior chamber Shaffer, RPC and Spaeth all three are used for grading the angle of the anterior chamber', 'role': 'assistant'}]