Before there was "Prefectures" of Japan, there were Provinces of Japan before the Meiji Restoration took place. There are around 70 Provinces scattered around Honshu, Shikoku, Kyushu, and Hokkaido.
The quiz does not include the island of Hokkaido.
These are PROVINCES and NOT prefectures.
Gokishichido is the name for ancient administrative units organized in Japan during the Asuka Period (538-710AD).