This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cornea and sclera, Subject name: Ophthalmology
Where are stem cells present in the cornea 
Select and explain. 
A. Epithelium, B. Stroma, C. Descemet's membrane, D. Limbus
D: Limbus
Answer: D: Limbus 
Explanation: Cornea Layers and regions of cornea: 1) Epithelium 2) Bowmen&;s membrane 3) stroma 4) Dua&;s layer 5) Descemet&;s membrane 6) Endothelium. The Junction of cornea and sclera is called as Limbus. Healing/ Regeneration capacity of cornea: Regeneration of corneal epithelial cells is mainly from stem cells, which are present as Palisades of vogt at the limbus. Ref:- Parsons diseases of eye; pg num:-4,192,193