You are answering a USMLE-style medical question. Question: A 26-year-old female complains of frequent, large volume urination. This negatively affects her sleep, as she has to frequently wake up at night to urinate. She also complains of increased thirst. Her past medical history is significant for bipolar disorder that is treated with lithium for 3 years. Serum osmolality is 425 mOsm/kg, and urine osmolality is 176 mOsm/kg. Which of the following best explains this patient’s serum and urine osmolality? Options: A) Hypothalamic over-production of antidiuretic hormone (ADH) B) Decreased production of ADH C) ADH resistance in the renal collecting ducts D) Increased sodium reabsorption and potassium excretion Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.