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
'Gut tube is developed from which germ layer 
Select and explain. 
A. Ectoderm, B. Mesoderm, C. Endoderm, D. Neuroectoderm
C: Endoderm
Answer: C: Endoderm 
Explanation: The gut is derived from the yolk sac, and hence is endodermal in origin.