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Stop generation immediately after outputing the Final Answer.

Ensure that your response strictly follows the format to maintain clarity and consistency. 
Question: Here are some premises:
Everyone at the mixer is a Grand Slam champion or an Oscar-nominated actor.
Every Grand Slam champion at the mixer is a professional tennis player.
All Oscar-nominated actors at the mixer are celebrities.
All professional tennis players at the mixer are athletes.
If a person at the mixer is a celebrity, then they are well paid.
If a person at the mixer is an athlete, then they are famous.
All well-paid people at the mixer live in tax havens.
Djokovic is at the mixer: if Djokovic is a famous athlete, then Djokovic is well-paid.
Here is a conclusion:
Djokovic is a Grand Slam champion.
Based on the premises, is the conclusion True, False, or Uncertain?
Answer: Uncertain