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a
Just before menstruation
b
Just after menstruation
c
At the time of fertilisation
d
Around the time of formation of Graafian follicle
answer is D.
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Detailed Solution
In the tertiary follicle, the primary oocyte completes its meiosis I to divide to unequal large secondary oocyte and a tiny first polar body. Soon the tertiary follicle transforms to Graafian follicle and is ready for ovulation.