During human fetal development, the pulmonary artery is connected to the aorta by a narrow duct called the ductus arteriosus. What is this structure called after it closes and becomes a fibrous remnant in an adult?

  • A
    Fossa ovalis
  • B
    Foramen ovale
  • C
    Ligamentum arteriosum
  • D
    None of the above

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