Contaminant means:
- a. Pure water only
- b. Unwanted impurity
- c. Only useful vitamin always
- d. Only pure food salt only
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Open drains are:
- a. Safest drinking source
- b. Always sterile
- c. Unhygienic and risky
- d. Best playground always
Chlorination helps:
- a. Only add pathogens
- b. Only create raw sewage
- c. Kill pathogens
- d. Only block screens
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