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 - \nSelect and explain. \nA. Beta 2 microglobulin, B. Beta 2 transferrin, C. Thyroglobulin, D. Transthyretin', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Beta 2 transferring is a protein seen in CSF and not in nasal discharge. Thus its presence is specific and sensitive for diagnosing CSF rhinorrhea. (Ref: Textbook of diseases of ENT, PL Dhingra, 7th edition, pg no. 184)', 'role': 'assistant'}]