The size of aperture of the pupil of eye is controlled by:

Iris

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Retina

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Cornea

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Conjunctive

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Solution

The correct option is A Iris
Iris is a opaque and pigmented structure in eye. It is visible as coloured portion. It regulates the amount of light entering the eye by controlling the size of pupil (an aperture in eye through which light enters). So, the correct answer is iris.

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