This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urolithiasis, Subject name: Surgery
Best investigation for ureteric stones is - 
Select and explain. 
A. USG, B. CT, C. X-ray KUB, D. IVP
B: CT
Answer: B: CT 
Explanation: Ans. is 'b' i.e., CT "Helical CT without oral or intravenous contrast is the preferred imaging modality for patients with renal colic or suspected urolithiasis" -- Smith's Urology