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
[{'content': 'Which fold of GIT is NOT permanent: \nSelect and explain. \nA. Ruga, B. Plicae semilunaris, C. Spiral Valve of Heister, D. Transverse rectal', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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).', 'role': 'assistant'}]