Phra Bat Somdet Phra Menthora Ramathibodi Sri Sinthara Mahamakut Phra Mongkut Phra Siam Deva Mahamakut Wittaya Maharaj
Phra Bat Somdej Phra Mongkut Phra Siam
Bat Somdej Phra Chao Krung Thonburi
None of these
Answer
Mongkut's full title in Thai was Phra Bat Somdet Phra Menthora Ramathibodi Sri Sinthara Mahamakut Phra Mongkut Phra Siam Deva Mahamakut Wittaya Maharaj. This title means "His Royal Majesty the Reverend King Ramathibodi Sri Sinthara Mahamakut Mongkut, the Buddha of Siam, the King of Great Education".
The Enigmatic Reign of Mongkut: A Captivating English Quiz on the King of Siam