This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
[{'content': 'Which inhibits gastric secretion ? \nSelect and explain. \nA. Secretin, B. Insulin, C. High gastric pH, D. Calcium', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Secretin Gastrin is a hormone which is produced by G-cells in the lateral wall of glands in the antral poion of gastric mucose. It is also found in pancreatic islets in fetal life, gastrinomas of pancreas, and pituitary glandQ, hypothalamus, medulla oblongata and in vagus & sciatic nerves.', 'role': 'assistant'}]