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: Unknown
[{'content': 'Which of the following tests are used in the evaluation of a suspected CSF leak? \nSelect and explain. \nA. Beta 2 microglobulin, B. Beta 2 transferrin, C. Tyroglobulin, D. Transthyretin', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Detection of beta-2 transferrin is considered pa of standard evaluation when CSF leak is suspected. Nasal and ear fluids are tested for detection of the beta-2 transferrin band by immunofixation electrophoresis (IFE) or Western blot analysis as a diagnostic tool for the presence of CSF or perilymph. This test is helpful in the differential diagnosis for CSF otorrhoea or CSF rhinorrhoea. The beta-2 transferrin band has not been detected in multiple fluids including serum, ear fluid, nasal secretions, saliva, tears or endolymph, indicating the specificity of the slower beta-2 transferrin isoform for CSF.', 'role': 'assistant'}]