The value of \cot 10^{\circ}\cdot \cot 20^{\circ}\cdot \cot 60^{\circ}\cdot \cot 70^{\circ}\cdot \cot 80^{\circ} is :
[A] -1
[B] 1
[C] \frac{1}{\sqrt{3}}
[D] \sqrt{3}
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