Given below are two statements, one labeled as Assertion (A) and the other labeled as Reason (R). **Assertion (A):** Rohtas and Kaimur districts are the leading producers of limestone and pyrites in Bihar. **Reason (R):** The south-western region of Bihar is dominated by the Vindhyan rock system, which is known for sedimentary deposits like limestone, dolomite, and pyrites. 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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