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: ENT
[{'content': 'Suprastructure of stapes develops from \nSelect and explain. \nA. Ectoderm, B. Endoderm, C. Mesoderm, D. Neuro Ectoderm', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Mesoderm of 2nd Branchial arch.', 'role': 'assistant'}]