Problem: The PMHNP is caring for an adult patient who has missed several of their recent appointments. The patient reports they cannot think about anything other than the fact that they might have breast cancer, even after their last mammogram showed no evidence of breast cancer. They had a cousin diagnosed with breast cancer two years ago and have felt this way ever since. The patient denies breast lumps, breast or nipple changes, or pain. Which of the following is the most likely diagnosis? Need Assignment Help? A. Factitious disorder B. Functional neurological symptom disorder C. Illness anxiety disorder D. Somatic symptom disorder