<prompt> A patient comes with hematemesis and melena. On the upper GI endoscopy there was no significant finding. 2 days later the patient rebleeds. Next line of investigation is:Emergency angiographyRepeat upper GI endoscopyEnteroscopyLaparotomy  <response>: Ans. b Repeat upper GI endoscopyRef: Sabiston 19th Edition, Page 1166 Endoscopy is advised even in cases in which previous endoscopy doesnt show any abnormality. 