Assertion $-A$: Carolus Linnaeus is known as the father of taxonomy.
Reason $-R$: The classification system proposed by him is still accepted today after some modifications.

• A
  Both Assertion $-A$ and Reason $-R$ are true,and Reason $-R$ is the correct explanation of Assertion $-A$.
• B
  Both Assertion $-A$ and Reason $-R$ are true,but Reason $-R$ is not the correct explanation of Assertion $-A$.
• C
  Assertion $-A$ is true,but Reason $-R$ is false.
• D
  Both Assertion $-A$ and Reason $-R$ are false.