Which among the following is not a natural insecticides

Options :
  1. Chrysanthemum
  2. Nicotiana tobaccum
  3. Ryania speciosa
  4. Piper nigrum
Answer and Explanation :-

Answer: Option 4


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This is the thing about life I've never really understood until now: we try so hard to control it, but bad things happen anyway. The only real control is an anti-control, a letting go.
-R.A. Nelson Teach Me