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In the given figure, RS is the tangent to the circle at the point L and MN is the diameter. If $\angle NML = 30^\circ$, then $\angle RLM$ is :

- (a)$30^\circ$
- (b)$60^\circ$
- (c)$90^\circ$
- (d)$120^\circ$
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(B) $60^\circ$