Statement $X$ : Basal bodies are involved in the formation of cilia and flagella.
Statement $Y$ : Nucleoli contain the nucleus and chromatin material.

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