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
Rate at which plasma is cleared of solute free water is known as: 
Select and explain. 
A. Free water clearance, B. Bound water clearance, C. Water clearance rate, D. Solute level clearance
A: Free water clearance
Answer: A: Free water clearance 
Explanation: Free Water Clearance: 

Is regulated by ADH. 
It is the rate at which plasma is cleared of solute free water.

​Free-water clearance (CH20) is calculated as the difference between water excretion (urine flow rate) and osmolar clearance: