This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Embryology and abdominal wall layer, Subject name: Anatomy
[{'content': 'Kupffer cells present in the adult liver are derived from \nSelect and explain. \nA. Mesoderm, B. Endoderm, C. Ectoderm, D. Neuroectoderm', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Kupffer cells are actually macrophages and are derived from mesoderm. Hepatocytes and the epithelial lining of the intrahepatic biliary tree are derived from endoderm diveiculum of forgut.', 'role': 'assistant'}]