Interesting thread,
I'll choose to save a loved one and pray neither of us ever get cancer!
Id choose, cows, pigs, chickens, dogs, fish, sheep, bees, humans, and maybe two exotics.
Im a pretty selfish person obviously lol

and I like my steaks and warm clothes and bees to keep the flowers going that give me my fruit and veg!
With regard to Human Chimp hybrid. I am sure you have all heard of Oliver the humanzee. If not youtube him, the full documentry is available online.
I am sure it has been done, whether or not to full term or not I am not sure. The Russians certinaly made some serious efforts to do it. Ilya Ivanovich Ivanov a Russian biologist attempted it around 1910. Google him to read about his works in full.
My question is, have any of the great apes ever been hybridised with each other? I know Orangutans have been hybridised with each other but I am talking about something more drastic. I suppose the most likely species are bonobo and chimps. I am sure early zoo curators did not care to know the difference or have the space to keep them separate. Gorilla and chimp Hybrids maybe a little more unlikely but I am sure they have been kept together in the past.