[Histonet] How to choose a topic of a master degree thesis?

[K M]

Glad to be here.This is  my very post here.Iam preparing to do a master
degree in anatomical pathology and I am little confused
how can I choose a topic to work on my thesis? My supervisor said to me go
to GOOGLE but google made me more confused!
By the way I am in Egypt and interest in immunohistochemistry studies .but
which organ I choose ?what disease I choose???
Any comment.