Input question: "Standing for words meaning ""which is what was to be proved"", which 3 letters appear at the end of a mathematical theorem?"

Output answer: qed

Input question: Since 1971, which US Federal holiday has held been on the second Monday in October?

Output answer: columbus day

Input question: Which treaty of 1929 established the Vatican City as an independent sovereign state?

Output answer: lateran treaty

Input question: Which king appointed John Dryden as the first official Poet Laureate?

Output answer:
charles ii