Find the rate of change of the area of a circle with respect to its radius $r$ when $r=5 \text{ cm}$.
- A$5 \pi \text{ cm}^2/\text{cm}$
- B$10 \pi \text{ cm}^2/\text{cm}$
- C$25 \pi \text{ cm}^2/\text{cm}$
- D$20 \pi \text{ cm}^2/\text{cm}$
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