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 incorrect.
A is incorrect but R is correct.
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The Correct Option isB
Solution and Explanation
The assertion is correct because methanogens are indeed present in the rumen of cattle and help in breaking down cellulose. However, the reason provided (about nutrition of cattle) is not a correct explanation of the assertion, as methanogens help in the fermentation process but not directly in providing nutrition.