Directions: In the following question, there are two statements labelled as Assertion (A) and Reason (R). Mark your answer as : (a) if both A and R are true and R is the correct explanation of A. (b) if both A and R are true but R is not the correct explanation of A. (c) if A is true but R is false. (d) if A is false but R is true. (e) if both A and R are false. Assertion: Hydrogen and helium show heating effect on adiabatic expansion through a porous plug. Reason: Hydrogen and helium have low critical temperature.