This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vascular Disorders, Subject name: Ophthalmology
Cattle truck appearance on fundus examination is a feature of: (Repeat) 
Select and explain. 
A. CRVO, B. Incomplete CRAO, C. Incomplete CRVO, D. Hypertensive retinopathy
B: Incomplete CRAO
Answer: B: Incomplete CRAO 
Explanation: Ans: B (Incomplete CRAO) Ref: Kan ski 7th edition; Clinical Ophthalmology; pg no 563-564Type of pigmentDisordersCorneal locationIronKerataconus Epithelium Oid opacity Epithelium Pterygium Epithelium Filtering Web Epithelium SiderosisMainly stroma BJood staining of corneaMainly stromaCopperWilson's disease, chalcosis Descemet's membraneMelaninPigment aspersion syndnomeEndotheliumExplanation:Refer 2011 Opthalmology question explanation