Spoiler Alert!

“Segregationist”, by Isaac Asimov (1967)

In the aftermath of robots (“metallos”) being granted legal equality
with biological humans, a transplant patient is offered the choice of
a partly-organic heart or a fully mechanical one. He chooses the
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This story was written several months before the first successful
human-to-human heart transplant, and it’s interesting that Asimov
chose to portray the procedure as a minor background detail. It’s also intriguing that, in 1967, he had characters who found segregation to be viscerally repugnant. But ultimately, this is a very minor Asimov.