This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Physiology
What is Charles law? 
Select and explain. 
A. PV = constant, B. V/T = constant, C. PV = n, D. None
B: V/T = constant
Answer: B: V/T = constant 
Explanation: Charles law states that the volume occupied by a fixed mass of gas at a constant pressure is directly propoional to absolute temperature V/T = a constant , v - volume, T - absolute temperature in KelvinRef: Textbook of medical physiology by Guyton and Hall,2nd South Asia edition.Pg no.328