Statement $P$: Enzymes are biological catalysts.
Statement $Q$: They are produced by living cells in small amounts to catalyze reactions.

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