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In the given figure, O is the centre of the circle. MN is the chord and the tangent ML at point M makes an angle of $70^\circ$ with MN. The measure of $\angle MON$ is:
- (a)$120^\circ$
- (b)$140^\circ$
- (c)$70^\circ$
- (d)$90^\circ$
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(B) $140^\circ$