Statement $P$: An $m-RNA$ consists of $75$ nucleotides.
Statement $Q$: There are $61$ types of codons in the cytoplasm.

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