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: Surgery
Best test to differentiate between medical and surgical jaudice is? 
Select and explain. 
A. Alkaline phosphatase, B. Bilirubin and serum enzymes, C. Enzymes, D. Ultrasound
D: Ultrasound
Answer: D: Ultrasound 
Explanation: None