Which type of cheese does the traditional Italian dessert Cassata use?

Cassata or cassata siciliana is a traditional cake from the Sicily region of Italy. Cassata is typically composed of a round sponge cake moistened with fruit juices or liqueur and layered with ricotta cheese and candied fruit (a filling also used with cannoli). Cassata has a shell of marzipan, pink and green colored icing, and decorative designs.

Source: Wikipedia