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: Anatomy
Enamel of teeth is derived from: 
Select and explain. 
A. Endoderm, B. Mesoderm, C. Ectoderm, D. None of the above
C: Ectoderm
Answer: C: Ectoderm 
Explanation: In general terms, the ectodermal germ layer gives rise to organs and structures that maintain contact with the outside world:The central nervous system;The peripheral nervous system;The sensory epithelium of the ear, nose, and eye; andThe epidermis, including the hair and nails.In addition, it gives rise to:Subcutaneous glands,The mammary glands,The pituitary gland,And enamel of the teeth.