Which one of the following conclusions is NOT supported by current biological research on schizophrenia?
A.Schizophrenia is associated with excess or oversensitive dopamine receptors.
B.There appears to be a strong genetic predisposition towards schizophrenia.
C.The ventricles of the brain are enlarged in many individuals with schizophrenia.
D.Schizophrenics produce excessive amounts of the neurotransmitter serotonin.
E.Prenatal viruses may play a role in the development of schizophrenia