Statement $X$: Biogas is used as a fuel for energy.
Statement $Y$: Biogas contains $H_2S$,$CO_2$,and oxygen gas.

• A
  Statement $X$ is true,$Y$ is false.
• B
  Statement $X$ is false,$Y$ is true.
• C
  Both statements $X$ and $Y$ are true.
• D
  Both statements $X$ and $Y$ are false.