This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'Investigation of choice in early phase of renal transplant \nSelect and explain. \nA. X ray, B. IVP, C. CT scan, D. Ultrasonography', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ref - Bailey and love 25 e p1424', 'role': 'assistant'}]