answer: #Person1# and Tony are playing question game. #Person1# asks Tony the foundation year of America and which planet is the nearest to the sun. Tony asks #Person1# the inventor of the light bulb.
documents: #Person1#: When was America discovered, Tony?
  #Person2#: I'm not certain. Do you know?
  #Person1#: America was discovered by Christopher Columbus in 1492.
  #Person2#: In a way that's right. But the Vikings travelled there long beforeColumbus. And what about the Red Indians?
  #Person1#: All right. Ask me a question now.
  #Person2#: Who invented the electric light bulb?
  #Person1#: That's easy. It was invented by Edison.
  #Person2#: Correct. Now for a harder question. Who will be the first men on Mars?
  #Person1#: I can't answer that. But I think Mars will be visited by men before theed of this century.
  #Person2#: Ask me a question now.
  #Person1#: All right. What is the nearest planet to the sun?
  #Person2#: That's easy. It's.. er. Venus. NO. Pluto. No. Wait a minute. It's Anthe tip of my tongue. Oh dear, what is the nearest planet to the sun?