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
[{'content': 'All of the following ocular structures are derived from the surface ectoderm except: \nSelect and explain. \nA. Crystalline lens, B. Substantia propria of the cornea, C. Conjunctival and corneal epithelium, D. Lacrimal glands', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Substantia propria of the cornea', 'role': 'assistant'}]