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': 'Bui,opliao ligLal membrane develops froui. \nSelect and explain. \nA. Ectoderm + Mesoderm, B. Ectoderm + Endoderm, C. Mesoderm + Endoderm, D. Ectoderm + Mesoderm + Endoderm', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. b. Ectoderm + Endoderm', 'role': 'assistant'}]