Find the odd number / letters / word from the given alternative.

Centaur
Tortoise
Goat
Lion

The odd one out is C. Goat.

Centaur, tortoise, and lion are all mythological creatures. A centaur is a creature with the head, arms, and torso of a human and the body and legs of a horse. A tortoise is a reptile with a hard shell that protects its soft body. A lion is a large cat with a mane of hair around its head. A goat is a hoofed animal with horns and a beard.

Goats are not mythological creatures. They are real animals that live on Earth.