The answer is C, Electroconvulsive therapy.
Electroconvulsive therapy is a type of treatment given to patients with severe major depression or bipolar disorder that has not responded to other treatments. The treatment is given under anaesthesia, that is, the patients are not conscious,, small electric currents are passed through the brain, intentionally triggering a brief seizure and cause certain reaction that will reverse some mental conditions
Electroconvulsive was introduced in 1930 but starting 1960, the use of the therapy has reduced significantly
Learn more about Electroconvulsive therapy here
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