The first and second dissociation constants of a diprotic acid $H_2A$ are $1.0 \times 10^{-5}$ and $5.0 \times 10^{-10}$ respectively. The overall dissociation constant of the acid is:
- A$5.0 \times 10^{-5}$
- B$5.0 \times 10^{15}$
- C$5.0 \times 10^{-15}$
- D$2.0 \times 10^5$
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