You are answering a USMLE-style medical question. Question: A 52-year-old woman presents to her primary care physician for abdominal pain and diarrhea. The patient states that she has been experiencing watery diarrhea for weeks now. During this same period she states she has been constantly thirsty and does not have the same energy levels that she once had. The patient has a past medical history of anxiety and depression and is currently taking fluoxetine. She was recently treated for a middle ear infection and sinusitis with amoxicillin-clavulanic acid one week ago. Her temperature is 99.5°F (37.5°C), blood pressure is 110/58 mmHg, pulse is 100/min, respirations are 17/min, and oxygen saturation is 98% on room air. Laboratory values are obtained and shown below. Serum: Na+: 139 mEq/L Cl-: 100 mEq/L K+: 2.9 mEq/L HCO3-: 27 mEq/L BUN: 25 mg/dL Glucose: 99 mg/dL Creatinine: 1.4 mg/dL Ca2+: 10.2 mg/dL AST: 12 U/L ALT: 10 U/L Which of the following is associated with the most likely diagnosis? Options: A) Enterotoxin B) Impaired iron absorption C) Increased serotonin production D) Invasive bacterial infection Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.