All you know about a person is that he has a personality disorder. Based on this information, you can assume that

a. the onset of the disorder occurred in middle age.
b. he has one of two forms of the disorder, according to the DSM-IV-TR.
c. the problem came on suddenly and could be classified as acute.
d. his behavior is inflexible and maladaptive.

Answer: d. his behavior is inflexible and maladaptive.