Answer: Chlorine
Notes: The correct answer is Chlorine. - Gammaxene (also known as Lindane) is a pesticide derived from hexachlorocyclohexane, which involves chlorine. - D.D.T. (Dichloro-Diphenyl-Trichloroethane) is a synthetic pesticide containing chlorine. - Bleaching powder (calcium hypochlorite) is a chlorine compound used for disinfection and bleaching. Chlorine is essential in various chemical processes and compounds, particularly in agriculture and sanitation.
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