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
Regarding CSF all the following statements are true except 
Select and explain. 
A. Its pH is less than blood, B. No neutrophils present normally, C. Formed by arachnoid villi, D. Persistent leakage can cause headache
C: Formed by arachnoid villi
Answer: C: Formed by arachnoid villi 
Explanation: C i.e. Formed by arachnoid villi