Input question: What metallic element has the highest electrical and thermal conductivity, and reflectivity?

Output answer: silver

Input question: Which geological period is popularly named the 'Coal Age'?

Output answer: carboniferous

Input question: Who first published and popularised the stories Snow White, Cinderella, Rumpelstiltskin, Rapunzel, Sleeping Beauty and Red Riding Hood?

Output answer: brothers grimm

Input question: The London store Harrods describes itself as Harrods of where

Output answer:
knightsbridge