Answer- A (Ethmoid)Kanski 5/e p558'The inferior wall of orbit consists of three bones: zygomatic, maxillary, and palatinea'.Boundaries of the OrbitRoofLesser wing of the sphenoidOrbital plate of the plateLateral wallGreater wing of the sphenoidZygomaticInferior wallZygomaticMaxillaryPalatineMedial wallFrontal process of the maxillaLacrimalEthmoidBoby of sphenoid
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