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
Lining of common bile duct 
Select and explain. 
A. Simple columnar, B. Ciliated columnar, C. Pseudo stratified squamous, D. Transitional
A: Simple columnar
Answer: A: Simple columnar 
Explanation: Common bile duct is lined by simple columnar epithelium , simple cuboidal epithelium at it's proximal region. Ref: IB Singh textbook of histology 6e pg 268.