This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Optic Nerve, Subject name: Ophthalmology
[{'content': 'Papilloedema is characterised by all EXCEPT \nSelect and explain. \nA. Sudden loss of vision, B. Blurred vision, C. Hyperaemic disc, D. Venous engorgement marked', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (Sudden loss of vision) (301- Khurana 4th)Differentiating features of Papilloedema, Papillitis and PseudopapillitisFeaturesPapilloedemaPapillitisPseudopapillitis1. LaterallyUsually bilateralU/L or B/LMay be U/L2. Symptoms (i) visual acquityTransient attacks of blurred vision** Later vision decreases due to optic atrophy* Marked loss of vision* Sudden onset refractive errorDefective vision(ii) Pain and TendernessAbsent- May be present with ocular movementsAbsent3. Fundus examination (i) MediaClearPosterior vitreous haze is commonClear(ii) Disc colourRed and juicy appearanceMarked hyperaemiaRaddishDisc marginBlurredBlurredNot well definedDisc swelling2-6 dioptresnot >3DDepending upon the degree of hypermetropia(iii) Peripapillary oedemaPresentPresentAbsents(iv)Venous engorgementMore marked*Less markedNot present(v) Retinal exudates(vi) Retinal hemorrage(vii) MaculaMore marked* MarkedLess markedAbsent Macular starUsually not presentNot present4. FieldEnlarged** blind spotCentral scatomaNo detect5. Fluorescent angiographyVertical oval pool of dye due to leakageMinimal leakage of dyeNo leakage of dye', 'role': 'assistant'}]