Which among the following is the main constituent of Biogas?

Which among the following is the main constituent of Biogas?
[A]Methane
[B]Propane
[C]Butane
[D]Ethane

Methane
Biogas comprises primarily methane (CH4) and carbon dioxide (CO2) and may have small amounts of hydrogen sulphide (H2S), moisture and siloxanes.

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