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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.

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Correct Answer - D
Prophase which is the first stage of mitosis follows the S and `G_(2)` phases of interphase. In the S and `G_(2)` phases the new DNA molecuels formed are not distinct but interwined. Prophase is marked by the initiation of condensation of chromosomal material. The chromosomal material becomes untangled during the process of chromatin condensation.

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