A 16-year-old girl presents with abdominal pain and a pelvic mass. Imaging reveals a large ovarian tumor with cystic and solid components. Serum alpha-fetoprotein (AFP) is markedly elevated at 8500 ng/mL, while beta-hCG is normal. Histology shows primitive germ cells with yolk sac differentiation. What is the most common germ cell tumor of the ovary in this age group?

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