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': 'Which of the following is derived from endoderm- \nSelect and explain. \nA. Gall bladder, B. Lens, C. Spleen, D. Lymph nodes', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]