\sin ^{2}5^{\circ}+\sin ^{2}10^{\circ}+\sin ^{2}15^{\circ}+......+\sin ^{2}85^{\circ}+\sin ^{2}90^{\circ} is equal to :
[A] 7\frac{1}{2}
[B] 8\frac{1}{2}
[C] 9\frac{1}{2}
[D] 9

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