A diagnosis of brief psychotic disorder requires that an individual demonstrate at least one of the symptoms in which of these groups? 

a. Delusions, hallucinations, or disorganized speech 

b. Grossly disorganized motor behavior such as agitation, lack of movement, or abnormal movement 

c. Absence of socialization, inability to feel pleasure, or lack of initiative 

d. Psychomotor retardation, anhedonia, or alogia 

Russell was diagnosed with brief psychotic disorder. Which of the following is most likely to be true regarding his illness or treatment? 

a. He must have had undiagnosed schizophrenia. 

b. He will almost certainly continue to have such episodes. 

c. His symptoms were induced by overwhelming stress. 

d. His treatment will have to be lifelong.

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