Simon Has Been Getting Mild Headaches Regularly Since the Past

Multiple Choice

Simon has been getting mild headaches regularly since the past few months. He is convinced that the headaches are indicative of a malignant brain tumor. Although magnetic resonance images provided no medical evidence in support of his claim, Simon still maintains that he has a tumor in his brain and is upset about the imagined consequences. In this instance, Simon is most likely to be suffering from

A) conversion disorder.
B) somatic symptom pain disorder.
C) depersonalization/derealization disorder.
D) illness anxiety disorder.