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
Central Retinal artery occlusion is known to be associated with: 
Select and explain. 
A. Panophthalmitis, B. Diabetic Retinopathy, C. CMV retinitis, D. Orbital mucomycosis
D: Orbital mucomycosis
Answer: D: Orbital mucomycosis 
Explanation: Ans. (d) Orbital mucomycosisRef: Yanoff 3/e, p. 592CRAO in orbital mucormycosis results from vascular invasion which is the hallmark of orbital mucormycosis. Mucormycosis is typically associated with thrombosis of vessels affected by the inflammatory process reflecting the vascular tropism of the fungus. Central Retinal artery Occlusion (CRAO) may be the presenting sign in a small subset of patients of Orbital mucormycosis.