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': 'Sudden loss of vision in patient with diabetic retinopathy is due to: \nSelect and explain. \nA. Cataract, B. Glaucoma, C. Vitreous defects, D. Papilloedema', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. Vitreous defects', 'role': 'assistant'}]