Most philosofical episodes of Black Mirror?

I asked my philosophy teacher if I could show my class a Black Mirror episode, and he accepted it. But I'm not really sure which one is more related with phylosophical issues, I was thinking maybe show "White Bear" because of the whole "is it fair to do that to a human being even though she killed and tortured an innocent child?"

Anyway leave your suggestions please, I really appreciated if you could give me some advice about what episode to show.

Edit: I've narrowed down my choices, it's gonna be or the Christmas special, The Entire History of You, White Bear, 15M merits or Be right back, depending on which my classmates prefer. Thank you all for your suggestions :D