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B
Primary oocyte stage
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C
Oogonial stage
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D
Mature ovum stage
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Solution
The correct option is A Secondary oocyte stage In human females, the tertiary follicle further changes into the mature follicle or Graafian follicle. The secondary oocyte, present inside Graafian follicle, forms a new membrane, called as zona pellucida, surrounding it. The Graafian follicle now ruptures to release the secondary oocyte (ovum) from the ovary by the process, called as ovulation.
So, the correct answer is 'Secondary oocyte stage'