<prompt> The triad originally described by Zol linger Ellison syndrome is characterized by:Peptic ulceration, gastric hypersecretion, non beta cell tumourPeptic ulceration, gastric hypersecretion, beta cell tumourPeptic ulceration, achlorhydria, non beta cell tumourPeptic ulceration, achlorhydria, beta cell tumour  <response>: Answer is A Peptic Ulceration, Gastric Hypersecretion, Non 3 Cell Tumour: Zollinger Ellison Syndrome is characterised by peptic ulceration due to gastrin hyper secretion by a non beta cell tumor. Remember: Most common site Q. of gastrinoma is Duodenum 50-70, Pancreas 20-40 - Harrison Most common hormone to be secreted besides gastrin is - ACTH Q Most common site of peptic ulcers produced is Is pa of Duodenum. Most valuable provocative test in identifying patients with ZES is the Secretin injection tests. Basal acid output is greater than 60 of out put induced by maximal stimulation i.e. BAO MAOQ 