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
Which of the following is derived from endoderm- 
Select and explain. 
A. Gall bladder, B. Lens, C. Spleen, D. Lymph nodes
A: Gall bladder
Answer: A: Gall bladder 
Explanation: None