The equation of the tangent to the circle,given by $x=5 \cos \theta, y=5 \sin \theta$ at the point $\theta=\frac{\pi}{3}$ on it,is
- A$x-\sqrt{3} y=-5$
- B$x+\sqrt{3} y=10$
- C$\sqrt{3} x+y=5 \sqrt{3}$
- D$\sqrt{3} x-y=0$
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