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Humans are unable to digest cellulose because the appropriate enzymes to breakdown the cellulose are lacking.
Some ruminants like cows and sheep contain certain symbiotic anaerobic bacteria (like Cellulomonas) in the flora of the rumen, and these bacteria produce enzymes called cellulases that help the microorganism to digest cellulose; the breakdown products are then used by the bacteria for proliferation.
Answer : (d)