What has NOT been proposed as a biological factor associated with the development of schizophrenic disorders

Question

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Cocaine use during adolescence is not a biological factor associated with the development of schizophrenic disorders. While drug use can increase the risk of developing mental health issues, it is not considered a biological factor. B, C, and D are all proposed biological factors associated with schizophrenia, including brain abnormalities, prenatal neurological damage, and excessive dopamine levels.

What Has NOT Been Proposed as a Biological Factor Associated