This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anatomy, Development and clinical examination, Subject name: Ophthalmology
The following ocular structure is not derived from surface ectoderm 
Select and explain. 
A. Crystalline lens, B. Sclera, C. Corneal epithelium, D. Epithelium of lacrimal glands
B: Sclera
Answer: B: Sclera 
Explanation: The ocular structure derived from surface ectoderm are The crystalline lens The epithelium of the cornea The epithelium of the conjunctiva Lacrimal gland The epithelium of the eyelids & its derivatives, .viz cilia, tarsal gland & conjunctival glands The epithelium lining the lacrimal apparatus The sclera is derived from the associated paraxial mesenchyme. Reference: