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B
Cavity of brain
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C
Graafian follicle of ovary
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D
Pericardium of heart
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Solution
The correct option is C Graafian follicle of ovary During oogenesis, each primary oocyte gets surrounded by a layer of granulosa cells and then called as the primary follicle. The primary follicles get surrounded by more layers of granulosa cells and a new theca and called as secondary follicles. The secondary follicle soon transforms into a mature tertiary follicle or Graafian follicle, which is characterized by a fluid-filled cavity, called as antrum.
So, the correct answer is 'Graafian follicle of ovary'