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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:
All aliens are extraterrestrials.
If someone is from Mars, then they are an alien.
No extraterrestrials are human.
All highly intelligent beings from Earth are humans.
Marvin is a highly intelligent being.
Marvin is either from Earth and from Mars, or he is from neither.
If Marvin is not from Earth, then Marvin is an extraterrestrial.
Here is a conclusion:
Marvin is an alien.
Based on the premises, is the conclusion True, False, or Uncertain?
Answer: Uncertain