This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
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: Some epithelia derived from ectoderm- the epithelium of the skin , hair follicles, sweat glands, sebaceous glands, and mammary glands - the epithelium over cornea and conjunctiva, external acoustic meatus and the outer surface of the tympanic membrane- the epithelium of some pa of the mouth, the lower pa of the anal canal, terminal pa of the male urethra, pas of the female external genitaliaRef: Human Embryology; Inderbir Singh; Tenth Edition; Page No: 95