Hades is the greek god of underworld. who did he place in charge of guarding the gate outside his kingdom?

charon

styx

cerberus

fleetus

Answer: Cerberus

According to Greek mythology, Cerberus was the dog of Hades.

It was a giant three-headed monstrous dog, with a tail serpent and had many serpent heads on its back, its mission was to protect the doors of the Greek underworld to prevent the living souls from entering without asking permission to the death and prevent the dead souls to leave the place.