Statement $P$: Callus culture medium contains auxin and cytokinin.
Statement $Q$: They are growth promoters and initiate cell division.

• A
  Both statement $P$ and statement $Q$ are correct.
• B
  Statement $P$ is correct,but statement $Q$ is incorrect.
• C
  Statement $P$ is incorrect,but statement $Q$ is correct.
• D
  Both statement $P$ and statement $Q$ are incorrect.