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
Osmotic pressure of 1 mol of ideal solute relative to pure water is: 
Select and explain. 
A. 2.5 atm, B. 5.2 atm, C. 22.4 atm, D. 15.2 atm
C: 22.4 atm
Answer: C: 22.4 atm 
Explanation: 1 mol of an ideal solute dissolved in 1000g of water (a 1m or molal solution) at 1 atm pressure yield a solution whose osmotic pressure relative to pure water is 22.4atm (250C). Ref: Principles of Medical Physiology by Sabyasachi Sircar, 2008/2-22