<prompt> CSF rhinorrhoea is diagnosed by -Beta 2 microglobulinBeta 2 transferrinThyroglobulinTransthyretin  <response>: 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 