Assertion: Prophase is the first stage of mitosis which follows S and `G_(1)` phases of interphase.
Reason: Prophase is marked by the intiation of clusters of chromocomes.
A. If both assertion and reason are true and reason is the correct explantion of assertion
B. If both assertion and reason are true but reason is not the correct explnantion of assertion.
C. If assertion is true but reason is false.
D. If both assertion and reason are false.