Assertion: Entropy is always constant for a closed system.
Reason: Closed system is always reversible.
- AA — Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
- BB — Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
- CC — Assertion is true but Reason is false.
- DD — Both Assertion and Reason are false.
✓ Correct answer: D
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