The nurse is caring for a client hospitalized on numerous occasions for complaints of chest pain and fainting spells, which she attributes to her deteriorating heart condition. No relatives or friends report ever actually seeing a fainting spell. After undergoing an extensive cardiac, pulmonary, GI, and neurologic workup, she’s told that all test results are completely negative. The client remains persistent in her belief that she has a serious illness. What diagnosis is appropriate for this client

A. Exhibitionism.
B. Somatoform disorder.
C. Degenerative dementia.
D. Echolali