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: Forensic Medicine
Specific for CSF in rhinorrhea: AI 10 
Select and explain. 
A. b-2 microglobulin, B. Albumin, C. Macroglobulin, D. b-2 transferrin
D: b-2 transferrin
Answer: D: b-2 transferrin 
Explanation: Ans. b-2 transferrin