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
IOC for GERD 
Select and explain. 
A. Endoscopy, B. Barium swallow, C. USG, D. CECT
A: Endoscopy
Answer: A: Endoscopy 
Explanation: IOC for GERD : endoscopy.