Solve this following

Question:

Mark $(\sqrt{ })$ against the correct answer in the following:

If $\sqrt{x}+\sqrt{y}=\sqrt{a}$ then $\frac{d y}{d x}=$ ?

A. $\frac{-\sqrt{x}}{\sqrt{y}}$

B. $-\frac{1}{2} \cdot \frac{\sqrt{y}}{\sqrt{x}}$

C. $\frac{-\sqrt{y}}{\sqrt{x}}$

D. None of these

Solution:

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