Which of the following layers is acellular in antral follicle?

Granulosa

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Theca interna

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Stroma

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Zona pellucida

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Solution

The correct option is D Zona pellucida
The antral follicle or the secondary follicle is identified when a fluid-filled cavity (antrum) is formed adjacent to the oocyte. The zona pellucida is basically a glycoprotein layer which surrounds the oocyte and separates it from the granulosa cells. This layer primarily contains enzymes required for the penetration of the sperm.
So, the correct answer is 'Zona pellucida'.

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