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': 'Krukenberg spindles \nSelect and explain. \nA. Involves anterior surface of cornea, B. Involves anterior lens surface, C. Involves posterior surface of cornea, D. Involves posterior surface of lens', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Deposition of pigment granules in posterior surface of cornea is called krukenbergs spindle it is seen in pigment dispersion syndrome.', 'role': 'assistant'}]