question: What is the answer: "An ""event horizon"" is the defining feature of which astronomical phenonmenon ?"
answer: black hole

question: What is the answer: Who was voted in as Mayor of London in May 2012?
answer: boris johnson

question: What is the answer: In 'Macbeth' who is 'Duncan's' son and 'Malcolm's' younger brother?
answer: donalbain

question: What is the answer: The painting 'The Haywain' by Constable depicts a cart crossing which river?
answer:
river stour