Medium
In the given diagram,what are the regions $P, Q,$ and $R$?
$P \quad\quad Q \quad \quad R$
$P \quad\quad Q \quad \quad R$
- AInner Medulla $\quad$ Outer Medulla $\quad$ Cortex
- BCortex $\quad$ Outer Medulla $\quad$ Inner Medulla
- CMedulla $\quad$ Outer Cortex $\quad$ Inner Cortex
- DInner Cortex $\quad$ Outer Cortex $\quad$ Medulla
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