The muscle that forms the colored part of the eye and adjusts the pupil to regulate the amount of light that enters the eye is called the

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The question asks for the name of the muscle that forms the colored part of the eye and adjusts the pupil to regulate light entry.
Option 1: lens. The lens sits behind the iris and focuses light onto the retina via accommodation; it is not the colored part and does not regulate pupil size.
Option 2: cornea. The cornea is the clear, outer surface that provides most of the eye's focusing power, but it does not affect pupil size or color, so it doesn't regulate light entry.
Option 3: retina. The retina is the light-sensitive tissue lining the back of the eye that captures light and initiates vision signals; it is not responsible for adjusting pupil diameter.
Option 4: iris. The iris is the colored portion of the eye. It contains muscles (sphincter and dilator pupillae) that change pupil size to regulate how much light enters, and it is what gives the eye its color.

The muscle that forms the colored part of the eye and adjusts the pupil to regulate the amount of light that enters the eye is called the

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