Identify $A$ to $D$ in the following diagram

1293-131

  • A

    $A-Filament, \;B-Pollen sac, \;C-Pollen grain, \;D-Line of dehiscence$

  • B

    $A-Filament, \;B-Pollen sac, \;C-Line of dehiscence, \;D-Pollen grain$

  • C

    $A-Filament, \;B- Line of dehiscence, \;C-Pollen sac, \;D-Pollen grains$

  • D

    $A-Filament,\; B- Line of dehiscence, \;C- Pollen sac, \;D-Pollen grains$

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  • [AIPMT 2012]