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Select the correct statement from the following.
(a)
Methanobacterium is an aerobic bacterium found in the rumen of cattle.
(b)
Biogas, commonly called gobar gas, is pure methane.
(c)
Activated sludge-sediment in settlement tanks of sewage treatment plant is a rich source of anaerobic bacteria.
(d)Biogas is produced by the activity of aerobic bacteria on animal waste.

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