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
Investigation of choice for a pregnant lady with upper abdominal mass 
Select and explain. 
A. Barium meal, B. MRI, C. CT scan, D. DSA
B: MRI
Answer: B: MRI 
Explanation: Ans. MRI