This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Stomach and aerial supply of abdomen, Subject name: Anatomy
Which fold of GIT is NOT permanent: 
Select and explain. 
A. Ruga, B. Plicae semilunaris, C. Spiral Valve of Heister, D. Transverse rectal
A: Ruga
Answer: A: Ruga 
Explanation: Ruga are the mucosal folds present in the stomach which disappear on distension, hence are not permanent. Plicae semilunaris/circulares are circular folds of mucous membrane and are permanent (not obliterated by distension).