Solid carbon dioxide is called dry ice.
$
  (a){\text{ True}} \\
  {\text{(b) False}} \\
 $

Hint – In this question use the concept that dry carbon dioxide is also used as a cooling agent, and is used as preserves in the food industry. This will help commenting upon the problem of whether solid carbon dioxide is used as dry ice or not.

Complete answer:

Dry ice is a solid form of carbon dioxide, which is primarily treated as a cooling agent.
Its advantage is that its temperature is lower than the water ice temperature and does not leave any residue.
It is also used in preserving frozen foods when mechanical cooling is not available.
Dry ice sublimates at 194.65 K (-78.5 0C) at Earth atmospheric pressures.
So the given statement is true.
Hence option (A) is the correct answer.

Note – There can be various definitions of dry ice, it can be considered as cold dense white mist produced by solid carbon dioxide in air and is used for theatrical effects. There is an interesting fact behind the name dry ice or solid carbon-dioxide as it does melt into a liquid when heated instead it directly gets converted into liquid just like naphthalene balls.