At Work a Group of Coworkers Is Discussing Psychosomatic Disorders

At work a group of coworkers is discussing psychosomatic disorders. Which of them has the best understanding of the term?

A) Hank, who says, "These disorders are not as bad as real physical illnesses."
B) Anna, who says, "The mind and the body sometimes work together to produce a disease."
C) Sal, who says, "I don't know why anyone would want to consciously create the symptoms of a disease."
D) Ann, who says, "If you have one of these disorders you have nothing to worry about, it is only in your head."