question: Q:Nine healthy subjects participate in a study of gastric secretions. Subjects are asked to eat a meal at hour 0, at which time the pH of stomach contents and rate of stomach acid secretions are measured over the next 4 hours. Results of the study are shown. Which of the following mediators is most active at point A in the graph?? 
  {'A': 'Prostaglandin', 'B': 'Secretin', 'C': 'Somatostatin', 'D': 'Glucose-dependent insulinotropic peptide', 'E': 'Acetylcholine'},