This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, 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: HUMAN EMBRYOLOGY-INDERBIR SINGH TENTH EDITION-PAGE NO:203 The pars cystica of the hepatic bud gives origin to the gallbladder and to the cystic duct. the pa of the hepatic bud proximal to the pars cystica forms the bile duct (Hepatic bud is endodermal in origin)