A 22-year-old unmarried woman presents with abdominal distension and pelvic pain. Imaging reveals a large ovarian mass. Serum α-fetoprotein (AFP) is elevated at 850 ng/mL, and β-hCG is normal. Histopathology confirms yolk sac tumor (endodermal sinus tumor) of the ovary. What is the drug of choice for first-line chemotherapy?

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