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Assertion: BOD of a river polluted by sewage is more than 20 ppm.

Reason: Polluted river contains excess of organic matter.

  • If both assertion and reason are true and reason is the correct explanation of assertion. 

  • If both assertion and reason are true but reason is not the correct explanation of assertion. 

  • If assertion is true but reason is false. 

  • If both assertion and reason are false.

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