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 track appearance in fundoscopy is due to? 
Select and explain. 
A. CRAO, B. CRVO, C. Retinitis pigmentosa, D. Diabetic retinopathy
A: CRAO
Answer: A: CRAO 
Explanation: ANSWER: (A) CRAOREF: Elsevier Comprehensive Guide, page 628Common fundoscopy findings:ConditionFindingOptic disc colobomaMorning glory appearanceCRAOCattle track appearance CRVOBlood and thunder fundusChloroquine toxicityBull's eye maculopathyQuinine toxicityCherry red spotRetinitis pigmentosaWaxy pallor of optic disc Bone spicule pigmentationCongenital syphilis/ RubellaSalt and pepper fundusSickle cell anemiaRising sun signCMV retinitisMozzarella pizza fundusAIDSCotton wool spots