Mark the odd one

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

Answer: Option 4

Explanation:

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Never let the future disturb you. You will meet it, if you have to, with the same weapons of reason which today arm you against the present.
-Marcus Aurelius Meditations