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: Surgery
CSF rhinorrhea can be differentiated by: 
Select and explain. 
A. High protein., B. Decreased glucose., C. Beta 2 transferin., D. All of the above.
D: All of the above.
Answer: D: All of the above. 
Explanation: None