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: Anaesthesia
Characteristic of an ideal gas is 
Select and explain. 
A. Volume is directly propoional to change in pressure, B. Volume is inversely propoional to change in temperature, C. At absolute temp. volume of gas is 1, D. Obeys Carles, Byles and Avagadro' laws
D: Obeys Carles, Byles and Avagadro' laws
Answer: D: Obeys Carles, Byles and Avagadro' laws 
Explanation: D i.e. Obeys Charles, boyle's & avogadro's laws