Assertion : For an Isothermal reversible process  $q=-w$ i.e., work done by the system equals the heat absorbed by the system.
Reason : Enthalpy change $(∆\mathrm{H})$ is zero for isothermal process.
 

if both (A) and (R) are false.

if both (A) and (R) are true and (R) is the correct explanation of (A)

if (A) is true but (R) is false.

if both (A) and (R) are true but (R) is not the correct explanation of (A)