This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General Embryology 2, Subject name: Anatomy
Buccopharyngeal membrane develops from: 
Select and explain. 
A. Ectoderm + Mesoderm, B. Ectoderm + Endoderm, C. Mesoderm + Endoderm, D. Ectoderm + Mesoderm + Endoderm
B: Ectoderm + Endoderm
Answer: B: Ectoderm + Endoderm 
Explanation: Oropharyngeal membrane of ectoderm + endoderm represents future opening of oral cavity.