This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Ophthalmology
All of the following ocular structures are derived from the surface ectoderm except: 
Select and explain. 
A. Crystalline lens, B. Substantia propria of the cornea, C. Conjunctival and corneal epithelium, D. Lacrimal glands
B: Substantia propria of the cornea
Answer: B: Substantia propria of the cornea 
Explanation: Ans. Substantia propria of the cornea