Assertion $(A)$: Geitonogamy is genetically similar to autogamy.
Reason $(R)$: In geitonogamy, pollen grains come from the same plant.

• A
  $A$ is wrong but $R$ is correct.
• B
  $A$ is correct but $R$ is wrong.
• C
  $A$ and $R$ both are correct, $R$ is not the correct explanation of $A$.
• D
  $A$ and $R$ both are correct, $R$ is the correct explanation of $A$.