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
Fibromuscular wall is seen in - 
Select and explain. 
A. Gall bladder, B. Duodenum, C. Jejunum, D. ileum
A: Gall bladder
Answer: A: Gall bladder 
Explanation: The extrahepatic biliary tree and gallbladder share a similar microscopic anatomy, consisting of a fibromuscular wall lined by mucin producing columnar epithelium similar to that seen in intrahepatic bile ducts.