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
Gerlach valve is present in - 
Select and explain. 
A. Gall bladder, B. Nasolacrimal duct, C. Pancreatic duct, D. Vermiform appendix
D: Vermiform appendix
Answer: D: Vermiform appendix 
Explanation: Ans. is 'd' i.e., Vermiform appendix o Gerlach's valve (valvula processus vermiformis) is a fold of mucous membrane found at opening of vermiform appendix of some people.