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
Which of the following embryonic structures gives rise to the adrenal coex? 
Select and explain. 
A. Ectoderm, B. Endoderm, C. Mesoderm, D. Mesonephros
C: Mesoderm
Answer: C: Mesoderm 
Explanation: Mesoderm