This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nose and paranasal sinuses, Subject name: ENT
[{'content': 'CSF rhinorrhoea is diagnosed by which of the following? \nSelect and explain. \nA. Beta 2 microglobulin, B. Beta 2 transferrin, C. Thyroglobulin, D. Transthyretin', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Beta 2 transferrin is a protein seen in CSF and not in nasal discharge. Its presence is a sensitive and specific test for CSF. Another protein is beta-trace protein is also specific for CSF. (Ref: PL Dhingra, 7th edition of Diseases of Ear, Nose and Throat, pg no.184)', 'role': 'assistant'}]