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
[{'content': 'Which of the following embryonic structures gives rise to the adrenal coex? \nSelect and explain. \nA. Ectoderm, B. Endoderm, C. Mesoderm, D. Mesonephros', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Mesoderm', 'role': 'assistant'}]