Review Question - QID 104802

A 27-year-old woman is brought to the emergency department by her roommate with severe right upper quadrant abdominal pain, nausea, and vomiting. The patient was complaining of a severe headache yesterday. Her roommate discovered an empty pill bottle in the patient's room today. The patient has a history of anxiety and migraines. She takes an oral contraceptive, a migraine regimen, and an anti-anxiety medication as needed. Her roommate recently had an anterior cruciate ligament repair for which she is taking oxycodone for pain control. The patient is a graduate student and does not smoke cigarettes, drinks alcohol socially, and does not use illicit drugs. The patient's temperature is 98.6°F (37.0°C), blood pressure is 116/60 mmHg, pulse is 96/min, and respirations are 16/min. Physical exam reveals a normal S1 and S2 without additional heart sounds. Her lungs are clear bilaterally. There is tenderness to palpation of the right upper quadrant. An EKG is obtained, which is demonstrated in Figure A. Her labs are notable for an aspartate aminotransferase (AST) of 6,567 mEq/L and an alanine aminotransferase (ALT) of 5,889 mEq/L. Which of the following is the most likely cause of this patient's findings?