This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Surgery
A patient comes with hematemesis and melena. On the upper GI endoscopy, there were no significant findings. 2-days later the patient rebleeds. Next line of investigation is 
Select and explain. 
A. Emergency angiography, B. Repeat upper GI endoscopy, C. Eteroscopy, D. Laprotomy
D: Laprotomy
Answer: D: Laprotomy 
Explanation: In case of intermittent upper GI bleeding for which no source has been found endoscopically or radiologically, laparotomy is done to see any missed common cause or angiodysplasia or for any obscure causes. SRB edition 5th page no .992