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: ENT
Management of persistent cases of CSF rhinorrhea is: 
Select and explain. 
A. Head low position on bed, B. Endoscopic repair, C. Straining activities, D. All of the above
B: Endoscopic repair
Answer: B: Endoscopic repair 
Explanation: CSF rhinorrhoea It refers to the drainage of cerebrospinal fluid through the nose. Measures of CSF components such as beta-2 transferrin has been shown to have a high positive predictive value. It has also been noted to be characterized by unilateral discharge. It is a sign of basal skull fracture. Management includes watchful waiting - leaks often stop spontaneously; if this does not occur then neurosurgical closure is necessary to prevent the spread of infection to the meninges.