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
Which of the following is a less useful diagnostic procedure in a case of acute haematemesis? 
Select and explain. 
A. Barium meal, B. Endoscopy, C. Gastric content aspiration, D. Angiography
A: Barium meal
Answer: A: Barium meal 
Explanation: Ans. Barium meal