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
Ear pinna develops from ____________ 
Select and explain. 
A. Ectoderm, B. Endoderm, C. Mesoderm, D. All
A: Ectoderm
Answer: A: Ectoderm 
Explanation: Ans:A.)Ectoderm First branchial cleft is the precursor of external auditory canal. Around the sixth week of embryonic life, a series of six tubercles appear around the first branchial cleft Branchial clefts are ectodermal in origin.