system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do men go bald solely on top of the head as opposed to on the sides or on the back?
gpt
There are different levels of "why".

There is something different about the hairs in that zone that makes them more sensitive to a particular hormone called DHT. There is a whole series of inflammatory events that slowly kill the follicle. 

Now, why are the hairs in one spot more sensitive than the hairs in another spot? No one knows.