The figure below shows the digestive system of a cockroach. What are $P$ and $Q$?

  • A
    Gizzard,Hepatic caecae
  • B
    Malpighian tubules,Hepatic caecae
  • C
    Hepatic caecae,Malpighian tubules
  • D
    Gizzard,Malpighian tubules

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