Pyrethrin is a common ingredient of

Options :
  1. mosquito coils
  2. fly sprays
  3. mosquito mats
  4. all the above

Answer and Explanation :-

Answer: Option 4


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A man who knows how little he knows is well, a man who knows how much he knows is sick. If, when you see the symptoms, you can tell, Your cure is quick.A sound man knows that sickness makes him sick and before he catches it his cure is quick.
-Lao Tzu The Chinese Translations