Which one of the following cellular parts is correctly matched with its characteristics?

  • A
    Centrioles - Sites for active $RNA$ synthesis.
  • B
    Lysosomes - Optimally active at a $pH$ of about $8.5$.
  • C
    Thylakoids - Flattened membranous sacs forming the grana of chloroplasts.
  • D
    Ribosomes - Those on chloroplasts are larger $(80S)$ while those in the cytoplasm are smaller $(70S)$.

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