Who was headmaster or headmistress at Hogwarts when Tom Riddle was a student?
Armando Dippet
<s>[INST] <<SYS>> Answer as briefly as you can to the following question. You are required to give a one-shot answer: <</SYS>> Who was headmaster or headmistress at Hogwarts when Tom Riddle was a student? [/INST] Armando Dippet </s>