Input question: The city of DeKalb, Illinois is credited as the first manufacturing site of what 'restraining' invention that revolutionized ranching in the US?

Output answer: barbed wire

Input question: What was the first programme to be broadcast on BBC2, after a power cut cancelled the opening night's gala performance?

Output answer: play school

Input question: Which university has colleges called Ustinov, St. Aidan's and Grey?

Output answer: durham

Input question: In Japan's feudal era, from 1185 onwards, a dominant warrior class emerged called what?

Output answer:
samurai