This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anatomy, Development and clinical examination, Subject name: Ophthalmology
Melanocytes in conjunctiva are derived from 
Select and explain. 
A. Neural ectoderm, B. Surface ectoderm, C. Mesoderm, D. Neural crest
D: Neural crest
Answer: D: Neural crest 
Explanation: Neural ectoderm : Retina with its pigment epithelium Epithelial layers of ciliary body Epithelial layers of iris Sphincter and dilator pupillae muscles Optic nerve (neuroglia and nervous elements only) Melanocytes Secondary vitreous Ciliary zonules (teiary vitreous) Reference : A K KHURANA OPHTHALMOLOGY, Edition4 , Page-10