Which of the following is not a pollutant

Options :
  1. thermal energy plant
  2. automatic vehicles
  3. nuclear power energy plant
  4. hydroelectric project
Answer and Explanation :-

Answer: Option 4

Explanation:

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I quote my father to people almost every day. Part of that is because if you dispense your own wisdom, others often dismiss it if you offer wisdom from a third party, it seems less arrogant and more acceptable. Of course, when you have someone like my dad in your back pocket, you can't help yourself. You quote him every chance you get.
-Randy Pausch The Last Lecture