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Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
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A 36-year-old female presents to the emergency department with right upper quadrant (RUQ) pain. She describes the pain as dull and getting progressively worse over the last several weeks. She denies any relationship to eating. Her past medical history is significant for endometriosis, which she manages with oral contraceptive pills, and follicular thyroid cancer, for which she underwent total thyroidectomy and now takes levothyroxine. The patient drinks a six pack of beer most nights of the week, and she has a 20 pack-year smoking history. She recently returned from visiting cousins in Mexico who have several dogs. Her temperature is 98.2°F (36.8°C), blood pressure is 132/87 mmHg, pulse is 76/min, and respirations are 14/min. On physical exam, her abdomen is soft and non-distended with tenderness in the right upper quadrant and palpable hepatomegaly. Laboratory testing is performed and reveals the following:

Aspartate aminotransferase (AST, GOT): 38 U/L
Alanine aminotransferase (ALT, GPT): 32 U/L
Alkaline phosphatase: 196 U/L
gamma-Glutamyltransferase (GGT): 107 U/L
Total bilirubin: 0.8 mg/dL

RUQ ultrasound demonstrates a solitary, well-demarcated, heterogeneous 6 cm mass in the right lobe of the liver. CT scan with contrast reveals peripheral enhancement during the early phase with centripetal flow during the portal venous phase. Which of the following is a risk factor for this condition?
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Oral contraceptive pill use