Read the assertion and reason carefully to mark the correct option in question.
Assertion: Sub-metacentric chromosome has one shorter and one longer arm.
Reason: Metacentric chromosome have one very long and one very short arm.
A. If both assertion and reason are true and the reason is the correct explanation of the assertion
B. If both assertion and reason are true but reason is not the correct explanation of the assertion.
C. If assertion is true but reason is false.
D. If both assertion and reason are false.