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
For renal stone, diagnosis is not done by – a) IVPb) MRIc) PET-Scand) USGe) CT scan 
Select and explain. 
A. a, B. c, C. bc, D. ad
C: bc
Answer: C: bc 
Explanation: Radiological investigations used for urinary stones are : -
	i)    Plane abdominal x-ray (KUB film) → First radiological test.
	ii)   Intravenous pyelogram (IVP).
	iii)  Non-contrast helical CT → Investigation of choice.
	iv)  USG