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
To detect gastrointestinal protein loss, all are used except 
Select and explain. 
A. Indium - III transferrin, B. α - 1 antitrypsin, C. 99m TC destran, D. 99m TC glycoheptone
D: 99m TC glycoheptone
Answer: D: 99m TC glycoheptone 
Explanation: 99m Tc glycoheptone is used for liver & biliary function.