The diagram of the human respiratory system is given below. What are $P$ and $Q$?
$\quad P \quad\quad Q$

  • A
    Larynx $\quad$ Diaphragm
  • B
    Epiglottis $\quad$ Diaphragm
  • C
    Epiglottis $\quad$ Pleural membrane
  • D
    Larynx $\quad$ Pleural membrane

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