Question:medium

Given below are two statements: Assertion (A): S. Typhi reduces sulphite to sulphide, to give a black metallic sheen on the colony in indicator media. Reason (R): Potassium Tellurite in Mc Leod's medium is reduced to metallic tellurium by Corynebacterium diphtheriae to produce black colony.

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In assertion-reason questions, both statements may be true, but always check whether the reason actually explains the assertion.
Updated On: May 18, 2026
  • Both (A) and (R) are correct and (R) is the correct explanation of (A)
  • Both (A) and (R) are correct but (R) is not the correct explanation of (A)
  • (A) is correct but (R) is not correct
  • (A) is not correct but (R) is correct
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The Correct Option is B

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