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
Investigation of choice in early phase of renal transplant 
Select and explain. 
A. X ray, B. IVP, C. CT scan, D. Ultrasonography
D: Ultrasonography
Answer: D: Ultrasonography 
Explanation: Ref - Bailey and love 25 e p1424