Assertion: Magnesium sulphate ingress is more dangerous than sodium and potassium sulphate ingress.
Reason: C-S-H is not stable in the presence of magnesium hydroxide.
a. assertion and reason are true and reason is correct explanation of assertion
b. assertion and reason are true and reason is not correct explanation of assertion
c. assertion is true but reason is false
d. both assertion and reason are false​