What is the name of the magical plant that Harry uses to communicate with Sirius Black in 'Harry Potter and the Goblet of Fire'?
Gillyweed
<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 the magical plant that Harry uses to communicate with Sirius Black in 'Harry Potter and the Goblet of Fire'? [/INST] Gillyweed </s>