Statement $X$: Lichens are composed of two main components. Statement $Y$: In lichens,the phycobiont is the heterotrophic component and the mycobiont is the autotrophic component.

• A
  Statement $X$ is true and Statement $Y$ is false.
• B
  Statement $X$ is true and Statement $Y$ is true,but Statement $Y$ is not the correct explanation of Statement $X$.
• C
  Statement $X$ is true and Statement $Y$ is the correct explanation of Statement $X$.
• D
  Statement $Y$ is true and Statement $X$ is false.