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': 'Parasympathetic stimulation of nerves innervating the islets of the pancreas will: \nSelect and explain. \nA. Have no effect, B. Increase secretion of insulin from B cells, C. Decrease secretion of insulin from B cells, D. Increase secretion of glucagon from B cells', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The pancreatic islets receive innervation from both the sympathetic and parasympathetic nervous system. Stimulation of the parasympathetic system increases secretion of insulin from the B cells. Stimulation of the sympathetic system increases glucagon secretion from the A cells. Insulin is inhibited by sympathetic stimulation. Ref: Molina P.E. (2013). Chapter 7. Endocrine Pancreas. In P.E. Molina (Ed),Endocrine Physiology, 4e.', 'role': 'assistant'}]