Statement $1$: Graphite is an example of a tetragonal system.
Statement $2$: For a tetragonal system,$a = b \neq c$,$\alpha = \beta = 90^o$,$\gamma = 90^o$.

• A
  Statement $1$ and Statement $2$ are both true and Statement $2$ is the correct explanation of Statement $1$.
• B
  Statement $1$ and Statement $2$ are both true,but Statement $2$ is not the correct explanation of Statement $1$.
• C
  Statement $1$ and Statement $2$ are both false.
• D
  Statement $1$ is true,but Statement $2$ is false.