This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anatomy, Development and clinical examination, Subject name: Ophthalmology
Sudden painful loss of vision is seen in __________ 
Select and explain. 
A. Papillitis, B. Central retinal vein obstruction, C. Optic neuritis, D. All
C: Optic neuritis
Answer: C: Optic neuritis 
Explanation: Sudden painful loss of vision * Acute congestive glaucomas (primary or secondary) * Acute iridocyclitis * Chemical injuries to the eyeball * Mechanical injuries to the eyeball Optic neuritis Reference : Ophthalmopalgy khurana 6th edition page 494