$MgO$ is used for lining furnaces because
- Aof high melting point of $MgO$
- B$MgO$ is a very good conductor of heat
- C$MgO$ is an electrical insulator
- DNone of these
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List-$I$ List-$II$ $a$. $Be$ $i$. Treatment of cancer $b$. $Mg$ $ii$. Extraction of metals $c$. $Ca$ $iii$. Incendiary bombs and signals $d$. $Ra$ $iv$. Windows of $X$-ray tubes $v$. Bearings for motor engines
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