Use reasoning to lead to the answer of the following question:
Billy was an astronaut. When he looked at the world from space, how did it look?\nOptions:\n- diverse\n- round\n- square\n- orange\n- complicated
 Reasoning process:
User
The world is round. Billy was an astronaut and it seems to be round when he looked at the world from the space. Therefore, the final answer is round.
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