Susan's brother was recently hospitalized when he was found dancing wildly in the center of a public fountain. her brother had not slept in five days before being hospitalized. her brother is now very quiet and maintains the same awkward pose for hours. susan is adamant that her brother does not have schizophrenia. which of the following diagnoses is most likely to be assigned to susan's brother?
a. schizophrenia
b. bipolar disorder
c. panic disorder
d. generalized anxiety disorder