Assertion $A$: $DNA$ cannot pass through the cell membrane.
Reason $R$: $DNA$ is a hydrophobic molecule.

• A
  Assertion-$A$ is correct and Reason $R$ is wrong.
• B
  Assertion-$A$ and Reason $R$ both are correct. But $R$ is not the correct explanation of $A$.
• C
  Assertion-$A$ is wrong and Reason $R$ is correct.
• D
  Assertion-$A$ and Reason $R$ both are correct. But $R$ is the correct explanation of $A$.