This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Retina, Subject name: Ophthalmology
Cattle track appearance is seen in: 
Select and explain. 
A. Central retinal vein occlusion, B. Central retinal aery occlusion, C. Central serous retinopathy, D. Diabetic retinopathy
B: Central retinal aery occlusion
Answer: B: Central retinal aery occlusion 
Explanation: Cattle truck appearance is seen in central retinal aery occlussion. Occurs due to stagnation of blood flow within an aeriole - giving rise to clumping of the blood column within the lumen M/C/C Embolism (Hollenhorst Plaque)