You are answering a USMLE-style medical question. Question: A 26-year-old nurse comes to the physician because of a 2-month history of fatigue. She has had a lot of stress at work and has been on sick leave for 2 weeks, but states that she would like to return to work. She has had several episodes of lower abdominal pain. She says, ""I know I have cancer."" She requests a diagnostic laparoscopy. She was diagnosed with peptic ulcer disease 6 months ago. Her only medication is omeprazole. The patient appears pale. Her temperature is 36.5° C (97.7° F), pulse is 120/min, and blood pressure is 90/65 mm Hg. On mental status examination she is tired and has a depressed mood. Physical examination shows pale conjunctivae and dry mucous membranes. There are numerous crusts along the course of her left arm veins. A grade 2/6 systolic ejection murmur is heard along the right-upper sternal border. Abdominal examination shows no abnormalities. There is generalized weakness of the proximal muscles. Laboratory studies show: Hemoglobin 7.5 g/dL Mean corpuscular volume 89 μm3 Reticulocyte count 13.3% Serum Sodium 139 mEq/L Potassium 3.9 mEq/L Calcium 8.5 mg/dL Test of the stool for occult blood is negative. Abdominal ultrasonography show no abnormalities. Which of the following is the most likely diagnosis?" Options: A) Factitious disorder B) Somatic symptom disorder C) Conversion disorder D) Acute small bowel hemorrhage Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.