Given below are two statements, one labelled as Assertion (A) and the other labelled as **Reason (R):** Assertion (A):** The Chemical Oxygen Demand (COD) of a municipal wastewater sample is always higher than its Biochemical Oxygen Demand (BOD). **Reason (R):** Chemical oxidants like potassium dichromate can oxidize biologically resistant organic substances that are not easily broken down by microbes in a standard BOD test. Select the correct answer using the codes given below:

Options:

• A: Both A and R are true and R is the correct explanation of A.
• B: Both A and R are true but R is not the correct explanation of A.
• C: A is true but R is false.
• D: A is false but R is true.

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