Input question: What sort of trees belong to the genus 'quercus'?

Output answer: oaks

Input question: Who presents the Radio 4 panel game 'The Unbelievable Truth' and is married to Victoria Coren?

Output answer: david mitchell

Input question: Whose 2015 album is 'Purpose'?

Output answer: justin bieber

Input question: By population what is the second city of Canada?

Output answer:
montreal