The figure below shows a human fetus within the uterus. Identify $P$ and $Q$.
$\quad\quad P \quad\quad\quad Q$

  • A
    Yolk sac $\quad$ Chorionic villi
  • B
    Chorionic villi $\quad$ Yolk sac
  • C
    Chorionic villi $\quad$ Umbilical cord
  • D
    Umbilical cord $\quad$ Chorionic villi

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