Bloodletting, often through the use of leeches, was a treatment devised centuries ago.What was this treatment used for?

Bloodletting, often through the use of leeches, was a treatment devised centuries ago.What was this treatment used for?
A)to reduce excessive blood in the brain
B)to correct a chemical imbalance in the brain
C)to reduce the negative effects of stress
D)to restore the balance of humors


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