This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Physiology
[{'content': 'Intrinsic factor is secreted by \nSelect and explain. \nA. G-cells, B. Pepsinogen secreting cells, C. Parietal or oxyntic cells, D. Pyloric glands', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The substance intrinsic factor, essential for absorption of vitamin B12 in the ileum, is secreted by the parietal cells along with the secretion of hydrochloric acid. -G cells of antrum of stomach secrete hormone gastrin whose primary actions include stimulation of gastric acid secretion & stimulation of growth of gastric mucosa. -Pepsinogen secreting cells(peptic cells of oxyntic glands) secrete pepsinogen(proenzyme) which is conveed to pepsin (active form) by action of HCl.Pepsin is a proteolytic enzyme that regulates protein digestion. -The pyloric glands secrete mainly mucus for protection of the pyloric mucosa from the stomach acid. They also secrete the hormone gastrin. Reference: Guyton,11e', 'role': 'assistant'}]