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: Unknown
Lens is derived from? 
Select and explain. 
A. Endoderm, B. Surface ectoderm, C. neural crest cells, D. none of the above
B: Surface ectoderm
Answer: B: Surface ectoderm 
Explanation: Ans. (b) Surface ectodermRef : Yanoff and ducker-ophthalmology 2/e, p 22-23, parson 20/ey p 5, Khurana 4/e, p 10