Q: Fact 1: Looking at bright objects has a negative impact on the eyes. Fact 2: Eye and dental disorders sometimes cause headaches. Given the two facts above, what can cause headaches?

Choices:
[1]. cloudy and rainy weather
[2]. hyperthyroidism
[3]. prolactin release
[4]. Damaged hearing
[5]. The bending of a ray of light
[6]. Leptospirosis
[7]. Warm air moving into cold air
[8]. looking at bright objects
The answer is:
[8].