question: Q:Pancreatic islets were isolated from a healthy, non-diabetic donor to perform an experiment to look at insulin secretion inhibition. Compounds would be added to separate wells containing the islets bathed in a high glucose solution for one hour. After one hour, the supernatant would be collected, and the insulin content would be measured with an enzyme-linked immunosorbent assay (ELISA). Which of the following compounds would result in the least insulin secretion when added to the islets?? 
  {'A': 'Dobutamine', 'B': 'Isoproterenol', 'C': 'Tolbutamide', 'D': 'Clonidine', 'E': 'Glyburide'},