The origin of this condition's name came from its believed emersion from an excess of black bile

Answer What is the black plague?

This one seems simple, but it stumped all three contestants. An excess of black bile was believed to have given rise to the Black Plague. Medicine during Medieval Europe was largely based on the ancient ideas of balancing the fluids of yellow and black bile, phlegm, and blood. Apparently, these fluids weren't balanced.

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