This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Ophthalmology
[{'content': "A 25 year-old-male presents with sudden painless loss of vision. The ocular and systemic examination is normal. What is probable diagnosis? \nSelect and explain. \nA. Retinal detachment, B. Eale's disease, C. Glaucoma, D. Optic neuritis", 'role': 'user'}, {'content': 'Answer: D \nExplanation: Optic neuritis is an inflammatory, demyelinating condition that causes acute, usually monocular, visual loss. Most cases of acute demyelinating optic neuritis occur in women (two-thirds) and typically develop in patients between the ages of 20 and 40.', 'role': 'assistant'}]