This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abdominal Radiography, Subject name: Radiology
A patient presents with right hypochondrium pain. Which of the following investigations should be done: 
Select and explain. 
A. CT, B. MRI, C. USG, D. Cholecystogram
C: USG
Answer: C: USG 
Explanation: Ans. (c) USGRef: Bailey 26th ed. H100