Which part of the human eye gives the eye its colour?

• Iris is the part of the eye that gives colour to the eye. For example, when we say a person has brown eyes, we are actually referring to the iris.
• In the iris, there is a small black opening through which light is passed. It is called the pupil. The iris controls the amount of light entering the eye by controlling the size of the pupil.

Therefore, the iris is the correct answer.