The Time Lord gave me three options. There’s only one still open: Genocide.

The Doctor, Genesis of the Daleks

Now Davros has created a machine creature, a monster, which will terrorize and destroy millions and millions of lives and lands throughout all eternity. He has given this machine a name: A Dalek. It is a word new to you but for a thousand generations it is name that will bring fear and terror. Now undoubtedly, Davros has one of the finest scientific minds in existence. But he has a fanatical desire to perpetuate himself in his machine. He works without conscience, without soul, without pity. And his machines are equally devoid of these qualities

The Doctor, Genesis of the Daleks,