Let us see each option SeparatelyOption a – Occurs due to break in cribriform plate. This is correct Option b – CSF contains glucose and option d It has less proteinsIn comparison to nasal secretions – CSF contains more of glucose and less of proteins (Turner 10/e, p 28) hence both options b and d are correctOption c – Requires immediate surgeryThis is not absolutely correct as: –– Early cases of post traumatic CSF rhinorrhea are managed conservatively. Only those cases where CSF rhinorrhea occurs persistently ––Surgical management should be done