$P$ is a small,round,reddish structure located on the dorsal side of the forebrain. It contains a stalk and releases a hormone $Q$ which controls the diurnal rhythm of the body. $P$ and $Q$ are

  • A
    Hypothalamus,$MSH$ respectively
  • B
    Pineal gland,melanin respectively
  • C
    Pineal gland,melatonin respectively
  • D
    Pituitary gland,$MSH$ respectively

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