Looking for a specific joke about research, control subjects, etc.

I'm trying to find a telling of a joke I heard that goes something like this.

An esteemed professor finishes a research lecture on new medical procedure he has developed that shows some great promise. After a few question answers, a meek voice from the back of the room - a medical student asks the professor why no control subjects were included in the study. The professor, booms into the mic, "Would you rather I condemned half the patients to their deaths?" to which the medical student replied, "Which half?"

Or something like that. I tried Googling this but couldn't find a version of it. I was hoping that some of you could either find this joke (is it a joke?) or craft it a bit for a good telling.

Not sure if this is the right place, way of posting this but I thought I'd give it a try.

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