This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Preoperative assessment and monitoring in anaesthesia, Subject name: Anaesthesia
A Patient is on regular medications for co-existing medical problems. Which of the following drugs may be stopped safely with minimal risk of adverse effects before an abdominal surgery 
Select and explain. 
A. Statins, B. Beta Blockers, C. ACE inhibitors/ACE Receptor Blockers, D. Steroids
C: ACE inhibitors/ACE Receptor Blockers
Answer: C: ACE inhibitors/ACE Receptor Blockers 
Explanation: ACE inhibitors / ARB's should be discontinued 24-48hrs before surgery. Beta blockers,calcium channel blockers,steroids,statins are continued