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': "A 25 year old male presents with painless sudden loss of vision, ocular and systemic examination is not contributory. What is probable diagnosis – \nSelect and explain. \nA. Retinal detachment, B. Eale's disease, C. Glaucoma, D. Cataract", 'role': 'user'}, {'content': "Answer: B \nExplanation: Both Eale's disease and Retinal detachment are causes of painless sudden loss of vision, however Eale's disease is a much more common cause than RD in a young male. Ocular and systemic examinations in both the conditions may be normal.", 'role': 'assistant'}]