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
[{'content': 'Buccopharyngeal membrane develops from: \nSelect and explain. \nA. Ectoderm + Mesoderm, B. Ectoderm + Endoderm, C. Mesoderm + Endoderm, D. Ectoderm + Mesoderm + Endoderm', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Oropharyngeal membrane of ectoderm + endoderm represents future opening of oral cavity.', 'role': 'assistant'}]