The following figure is a schematic representation of oogenesis. Which cells are $P$ and $Q$?
$\quad\quad\quad P\quad\quad\quad Q$

• A
  Secondary oocyte $\quad$ Primary oocyte
• B
  Primary oocyte $\quad$ Ootid
• C
  Secondary oocyte $\quad$ Ootid
• D
  Primary oocyte $\quad$ Secondary oocyte