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': 'Patient complains of sudden onset blindness but does not experience any pain, the cause is \nSelect and explain. \nA. Glaucoma, B. Cataract, C. Vitreous haemorrhage, D. Age related macular degeneration', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Vitreous haemorrhage", 'role': 'assistant'}]