Compound is a pure substance.

The correct option is A True

• Pure substances are those which are composed of only one type of atoms or one type of molecules.
• Compounds are pure substances made up of molecules formed by the chemical combination of two or more atoms in a fixed proportion.
• Example: water (${\mathrm{H}}_2\mathrm{O}$), carbon dioxide (${\mathrm{CO}}_2$).

Hence, the given statement is true.