This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anesthesia, Subject name: Pharmacology
Which of these can be safely stopped before an abdominal surgery? 
Select and explain. 
A. ACE inhibitors, B. Beta blocker, C. Statins, D. Steroids
A: ACE inhibitors
Answer: A: ACE inhibitors 
Explanation: Answer is option 1, angiotensin conveing enzyme ACE inhibitors are known to cause acute GI symptoms due to various pathophysiological alterations including systemic hypotension leading to mesenteric hypoperfusion, pancreatitis, and angioedema.