You are answering a USMLE-style medical question. Question: A 27-year-old man presents to the emergency department due to a change in his skin color. The patient went on a long hike this morning, and his girlfriend noticed that his skin had changed color when they were driving home. The patient has a past medical history of marijuana use, IV drug use, alcohol use, and asthma. His current medications include albuterol, fluticasone, and ibuprofen. His temperature is 97.5°F (36.4°C), blood pressure is 120/75 mmHg, pulse is 60/min, respirations are 10/min, and oxygen saturation is 98% on room air. Laboratory studies are ordered and are seen below. Hemoglobin: 10 g/dL Hematocrit: 32% Leukocyte count: 5,500 cells/mm^3 with normal differential Platelet count: 207,000/mm^3 Serum: Na+: 139 mEq/L Cl-: 99 mEq/L K+: 4.3 mEq/L HCO3-: 24 mEq/L BUN: 17 mg/dL Glucose: 89 mg/dL Creatinine: 1.0 mg/dL Ca2+: 10.1 mg/dL Bilirubin, total: 11.3 mg/dL Bilirubin, direct: 7.8 mg/dL Physical exam is notable for a patient with skin that appears yellow/orange. Cardiac, pulmonary, abdominal, and neurological exams are within normal limits. Which of the following is associated with this patient's underlying pathology? Options: A) A pathology responsive to sofosbuvir B) Decreased UDP-glucuronyl transferase activity C) Hyperpigmentation of the liver D) Increased consumption of beta-carotene Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.