Well most of the time we see bishop he's usually a android("Aliens", "Aliens:colonial marines", Aliens Vs Predator"(2010),Alien 3) but in Prometheus and Aliens vs. Predator he's human. But when you take some of the reasons that bishop sent a android to do his job was when it was dangerous. When he was dying he would be there to see it. So I would have to go with human on this one, because he has about six soldiers with him and its not very dangerous to go after a woman who has a chestburster inside her and the prison has no weapons at all.
