Q: You are presented with the quiz "What makes the pupils sensitive?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "light enters the eye through an opening called the pupil" and "dilation makes the eye very sensitive to sunlight". So, what's the best answer to the question?

Choose your answer from:
[1]. environment.
[2]. nerves.
[3]. heat.
[4]. air.
[5]. ultraviolet light.
[6]. dilation.
[7]. infrared light.
[8]. light.
The answer is:
[6].