This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gastrointestinal System, Subject name: Physiology
[{'content': 'The neurotransmitter at the vagal nerve ending on the G-cell is: \nSelect and explain. \nA. Ach, B. Neurotensin, C. Bombesin, D. Entero-oxyntin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: - G-cell in the pylorus secretes gastrin. - G-cell is innervated by vagal fibers; the transmitter of these fibers is bombesin, also known as gastrin-releasing peptide (GRP). - Neurotensin and entero-oxyntin are the peptides that influence the intestinal phase of the gastric acid secretion.', 'role': 'assistant'}]