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
[{'content': 'To detect gastrointestinal protein loss, all are used except \nSelect and explain. \nA. Indium - III transferrin, B. α - 1 antitrypsin, C. 99m TC destran, D. 99m TC glycoheptone', 'role': 'user'}, {'content': 'Answer: D \nExplanation: 99m Tc glycoheptone is used for liver & biliary function.', 'role': 'assistant'}]