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
Which of the following is derived from ectoderm- 
Select and explain. 
A. Epithelium of iris, B. Ciliary muscles, C. Vascular endothelium, D. Sclera
A: Epithelium of iris
Answer: A: Epithelium of iris 
Explanation: Ans-A