This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Brain , Subject name: Anatomy
Maximum amount of CSF is found in? 
Select and explain. 
A. Ventricular system, B. Subarachnoid space, C. Epdural space, D. Sub-pial space
B: Subarachnoid space
Answer: B: Subarachnoid space 
Explanation: CSF is a clear, colorless and slightly alkaline fluid which is almost cell-free.In an adult, the total volume of CSF is about 150 ml, out of which only 30 ml is in the ventricular system and the remainder is in the subarachnoid space.(Ref : Vishram Singh textbook of clinical neuroanatomy second edition pg 194)