All of the following statements are evidence against the dopamine hypothesis of schizophrenia except:
a. LSD, or drugs that increase serotonin, cause psychotic symptoms
b. The atypical medications affect both dopamine and serotonin
c. There does not appear to be an increase in dopamine metabolites in individuals with schizophrenia
d. There is a very short time lag between the start of medication and symptom improvement