What is the name of Severus Snape's childhood friend who later became a Death Eater?
Lily Evans
<s>[INST] <<SYS>> Answer as briefly as you can to the following question. You are required to give a one-shot answer: <</SYS>> What is the name of Severus Snape's childhood friend who later became a Death Eater? [/INST] Lily Evans </s>