Correct Answer: It becomes a zombie pigman
Zombie pigmen can spawn in the Nether, from nether portals, or from pigs struck by lightning. They have a 5% chance of spawning as a baby zombie pigman, and a baby zombie pigman has a 5% chance of spawning as a chicken jockey. All zombie pigmen spawn with a golden sword, which has a small chance of being enchanted. This chance increases at higher difficulties, and the swords enchantment is usually a higher level. On Halloween (October 31), zombie pigmen have a 22.5% chance of spawning with a pumpkin or a 2.5% chance of spawning with a jack o-lantern equipped as headgear.