During sewage treatment, biogases are produced which includes :

Options

A. Hydrogen sulfide, nitrogen, methane
B. Methane, hydrogen sulfide, carbon dioxide
C. Methane, oxygen, hydrogen sulfide
D. Hydrogen sulfide, methane, sulfur dioxide

Answer

B

Explanation

In sewage treatment certain bacteria which grow anaerobically on cellulose material produce a large amount of methane along with `CO_(2)` and `H_2`. These bacteria are collectively called methanogens.