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
Which of the following law is used for calculating osmotic pressure? 
Select and explain. 
A. Bernoulli's law, B. Ohm's law, C. Van't Hoff law, D. Poiseuille's law
C: Van't Hoff law
Answer: C: Van't Hoff law 
Explanation: Van't Hoff law is used for calculating osmotic pressure of a solution. Osmotic pressure of a solution depends upon the number of paicles in the solution. According to Van't Hoff law: Osmotic pressure: iC R = Gas constant T = Absolute temperature i = Number of ions C = Molar concentration Ref: Biophysics By P.S Mishra, page 108