Medium
If $f$ and $g$ are differentiable functions satisfying $g^{\prime}(a)=2$,$g(a)=b$,and $f \circ g = I$,where $I$ is an identity function,then $f^{\prime}(b)$ is equal to
- A$\frac{1}{2}$
- B$\frac{3}{2}$
- C$\frac{2}{3}$
- D$2$
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