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': 'Voissus ring is seen in: \nSelect and explain. \nA. Cornea, B. Retina, C. Anterior capsule, D. Posterior capsule', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Anterior capsule', 'role': 'assistant'}]