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
Excretory urography should be cautiously performed in 
Select and explain. 
A. Bone 2deg, B. Multiple myeloma, C. Neuroblastoma, D. Leukemia
B: Multiple myeloma
Answer: B: Multiple myeloma 
Explanation: B i.e. Multiple Myeloma