Nemesis: Hunter - Hunted

Alliance should select Blood Elf.
Horde should select Human.
http://www.warcraftrealms.com/census.php

Kuros has something different to say depending on which one you pick.

Blood Elf: "A fine choice. Blood Elves are a blight upon this world and must be destroyed or driven out of Draenor."

Forsaken: "Death incarnate now walks the land. These Forsaken are a crime against life itself... anathema to the Light. For that alone they must all be purged from Draenor."*

Goblin: "In my tongue, Goblin roughly translates to parasite. A fitting name they have given themselves. As with any pest, they must be exterminated. Let their deaths serve as a lesson to the rest of this so called Alliance."

Orc: "Orc...
<Kuros spits>
You would do all denizens of this world a great service by ridding these lands of orc."

Pandaren: "These Pandaren had a choice to serve in your mighty army, but instead opted to betray the Alliance and join the enemy. Now they aid the orcs in their mission to kill all Draenei. The traitorous Pandaren of the Horde must be exterminated."

Tauren: "On Argus, we hunted powerful horned beasts like your Tauren for sport. Prove your might over this worthy adversary!"

Troll: "Trolls, conspirators one and all. The troll invaders must be crushed and sent back to their savage gods!"

*As a death knight, I find this offensive. On a personal level.

Quest can bug out and won't let you accept the followup nor will you able to redo the quest without gm help.

If you finished this quest, but can't move on to the next, then you need to contact a game master and ask him to "redo" the quest for you or make him start the "specific" race quest for you directly.