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: Radiology
What is least useful as diagnostic procedure in case of acute haemetemesis 
Select and explain. 
A. Barium meal, B. Endoscopy, C. Gastric content aspiration, D. Angiography
C: Gastric content aspiration
Answer: C: Gastric content aspiration 
Explanation: C i.e. Gastric content aspiration - Patient is already having frank haematemesis (upper GI bleed coming through mouth). So there is no diagnostic role of gastric aspiration. It may be of some value, when there is doubt of upper GI bleed. Endoscopy is the investigation of choice for upper GI bleedQ. Endoscopy is helpful in dx of Oesophagitis, gastritis, ulcer, reflux, carcinoma, varicose veins. Barium meal is helpful in diagnosing ulcer & gastritis. Angiography tells about bleeding vessel.