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: Medicine
The pancreas arises from which embryonic germ layer 
Select and explain. 
A. Ectoderm, B. Endoderm, C. Mesoderm, D. None of the above
B: Endoderm
Answer: B: Endoderm 
Explanation: None