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': 'Investigation of choice for diagnosis of splenic rupture – \nSelect and explain. \nA. Peritoneal lavage, B. Ultrasound, C. CT scan, D. MRI', 'role': 'user'}, {'content': 'Answer: C \nExplanation: "CT has become the gold standard for the assessment of abdominal trauma particularly solid parenchymal injury".', 'role': 'assistant'}]