This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hepatobiliary System, Subject name: Anatomy
Valve of heister is seen in - 
Select and explain. 
A. Cystic duct, B. Common bile duct, C. Common hepatic duct, D. Pancreatic duct
A: Cystic duct
Answer: A: Cystic duct 
Explanation: Ans. is 'a'- i.e., Cystic duct o The mucous membrane of the cystic duct forms a series of 5-12 crescentic folds, arranged spirally to form the so called spiral valve of Heister. This is not a true valve.o This question is a direct repeat from NBE based AI-2013