Hawaii is home to the only royal palace in the U.S., called what?

Here is the question :

HAWAII IS HOME TO THE ONLY ROYAL PALACE IN THE U.S., CALLED WHAT?

Here is the option for the question :

Iolani Palace
Lanai Palace
Molokai Palace
Mandalay Palace

The Answer:

And, the answer for the the question is :

Iolani Palace

Explanation:

[STC0010373]. Iolani Palace became the official royal residence of King Kamehameha III in 1845, despite the fact that at the time it was merely a huge house. This event marked the beginning of the palace’s long history. The location was refurbished and expanded into a full-fledged palace in the year 1882. Since that time, it has served as a luxurious house and a venue for royal entertainment for Hawaii’s reigning kings. To this day, it is the only royal palace in the country.