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
[{'content': 'For renal stone, diagnosis is not done by – a) IVPb) MRIc) PET-Scand) USGe) CT scan \nSelect and explain. \nA. a, B. c, C. bc, D. ad', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Radiological investigations used for urinary stones are : -\n\ti)\xa0\xa0\xa0 Plane abdominal x-ray (KUB film) → First radiological test.\n\tii) \xa0\xa0Intravenous pyelogram (IVP).\n\tiii) \xa0Non-contrast helical CT → Investigation of choice.\n\tiv) \xa0USG', 'role': 'assistant'}]