This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous system, Subject name: Physiology
Which of following channel play a role in CSF formation? 
Select and explain. 
A. Cl-and k+exchanger, B. Na+symoper, C. K+channel, D. Cl- channel
A: Cl-and k+exchanger
Answer: A: Cl-and k+exchanger 
Explanation: K+-cl- exchanger helps in creating osmotic gradiant Ref gk pal pg no 1156