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: Physiology
Specific gravity of CSF is? 
Select and explain. 
A. 1.003 - 1.008, B. 1.006 - 1.009, C. 1.001 - 1.003, D. 1.010 - 1.013
B: 1.006 - 1.009
Answer: B: 1.006 - 1.009 
Explanation: 1.006 -- 1.009 REF: Ganong's 22" ed p. 613 Specific gravity of CSF is 1.006 -- 1.009