O-hydroxy benzene sulfonic acid on heating to 373 K changes to p-hydroxybenzene sulfonic acid. Reason: Sulphonation of phenol is a reversible process.
a) Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.
b) Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
c) Assertion is true, but Reason is false.
d) Assertion is false, but Reason is true.