Mark the odd one

Options :
  1. Pistia
  2. Hydrilla
  3. Vallisneria
  4. Casuarina
Answer and Explanation :-

Answer: Option 4

Explanation:

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Saying 'I could have done more,' Zin, is what marks a man as a man and not a God.
-R. Scott Bakker The Darkness That Comes Before