Calcium oxide is also called lime or quicklime.

The correct option is A True

Quick lime:

• Calcium oxide $\left(\mathrm{CaO}\right)$ is otherwise known as lime or quicklime.
• It is a white or greyish white solid produced in large quantities by thermal decomposition of Calcium carbonate(Slaked lime).
• The balanced chemical reaction of thermal decomposition can be written as:

$\underset{\mathrm{Calcium}\mathrm{carbonate}}{{\mathrm{CaCO}}_3}\stackrel{∆}{\to }\underset{\mathrm{Quick}\mathrm{lime}}{\mathrm{CaO}}+\underset{\mathrm{Carbon}\mathrm{dioxide}}{{\mathrm{CO}}_2}$

Hence, the given statement is true.