King Maha Vajiralongkorn crowned King of Thailand

King Maha Vajiralongkorn has been crowned as the Thai King.

The three-day coronation, which started on 4th May, is the first since Vajiralongkorn's adored and revered father was crowned in 1950.
He was carried by soldiers on a gilded palanquin through the streets of Bangkok on 5th May, in front of crowds who craned to witness the historic event.

Vajiralongkorn is the King of Thailand since 2016.
He is the only son of King Bhumibol Adulyadej and Queen Sirikit.
In 1972, at the age of 20, he was made crown prince by his father.
After his father's death on 13 October 2016, he was expected to accede to the throne of Thailand but asked for time to mourn before taking the throne.
He accepted the throne on the night of 1 December 2016.
His coronation took place from 4-6 May 2019.
The Thai government retroactively declared his reign to have begun on 13 October 2016, upon his father's death.
As the tenth monarch of the Chakri dynasty, he is also styled as Rama X.
Aged 64 at that time, Vajiralongkorn became the oldest Thai monarch to ascend to the throne.

Q. King Maha Vajiralongkorn has been crowned as the king of which country?
a. Cambodia
b. Indonesia
c. Bhutan
d. Thailand