What magical creature can be summoned using the incantation 'Expecto Patronum'?
A Patronus.
<s>[INST] <<SYS>> Answer as briefly as you can to the following question. You are required to give a one-shot answer: <</SYS>> What magical creature can be summoned using the incantation 'Expecto Patronum'? [/INST] A Patronus. </s>