_ The refractory brick which has good thermal shock resistance at high temperature but cracks on cooling below 400¬¨‚àûC is$?

_ The refractory brick which has good thermal shock resistance at high

1.	_ The refractory brick which has good thermal shock resistance at high temperature but cracks on cooling below 400¬¨‚àûC is$?
A.	Magnesite
B.	Chrome
C.	Silica
D.	Fireclay
Answer» D. Fireclay