If $S_1$ and $S_2$ are two straight lines such that the reflection of $S_1$ in $S_2$ and the reflection of $S_2$ in $S_1$ coincide,the angle between $S_1$ and $S_2$ is equal to?
- A$\frac{\pi}{3}$
- B$\frac{\pi}{6}$
- C$\frac{\pi}{4}$
- DData is insufficient.
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