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B
Sclera
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C
Cornea
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D
Retina
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Solution
The correct option is A Choroid The eyeball has three coats namely sclera, choroid and retina. The white and opaque sclera has a ring-shaped scleral venous sinus at its junction with the cornea. The cornea is the transparent window of the eye located within otherwise opaque sclera. The choroid is a dark pigmented thin vascular layer and is characterized by the presence of many blood vessels. The third layer retina contains rod and cone cells, the blood vessels coming from optic nerve open in the retina.