This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.N.S, Subject name: Medicine
All of the following is less in CSF when compared to plasma Except 
Select and explain. 
A. Glucose, B. Protein, C. Calcium, D. Chloride
D: Chloride
Answer: D: Chloride 
Explanation: Plasma chloride level is 96-106meq/LCSF chloride level is 116-122meq/LReference: Harrison&;s Principles of Internal Medicine; 19th edition; Appendix; Laboratory values of clinical impoance