Who concocts a love potion meant for Harry that Ron ends up taking by mistake?
Romilda Vane
<s>[INST] <<SYS>> Answer as briefly as you can to the following question. You are required to give a one-shot answer: <</SYS>> Who concocts a love potion meant for Harry that Ron ends up taking by mistake? [/INST] Romilda Vane </s>