The type of somatoform disorder involving an individual developing or imagining symptoms of a disease or sickness is __________.

Hypochondriasis involves persistent worry or belief that one has a serious illness, often interpreting ordinary bodily sensations as signs of disease. Therefore, the best answer is “hypochondrias” (A). Somatization disorder involves multiple physical complaints, while conversion disorder involves neurological-like symptoms; Munchausen’s syndrome involves deliberately producing or pretending to have symptoms.

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