If $y = \sqrt{\sin x + \sqrt{\sin x + \sqrt{\sin x + \dots \infty}}}$,then the value of $\frac{d^2 y}{d x^2}$ at the point $(\pi, 1)$ is

  • A
    $2$
  • B
    $-2$
  • C
    $-\frac{1}{2}$
  • D
    $\frac{1}{2}$

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