Which of the following treatments was first used in the 1930s to treat schizophrenia but is now used primarily to treat severe depression?

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Electroconvulsive therapy (ECT) was first used in the 1930s to treat schizophrenia, but is now primarily used to treat severe depression. Insulin coma therapy (A) was also commonly used in the 1930s to treat schizophrenia, but is no longer used due to its risks and lack of effectiveness. Prefrontal lobotomy (B) and psychosurgery (C) were also used in the past to treat schizophrenia, but have largely been abandoned due to ethical concerns and the availability of more effective and less invasive treatments.

Which of the Following Treatments Was First Used in the 1930s