GMAT Quantitative Reasoning Question 67: Simplifying Radical Terms

 
Try the following GMAT Quantitative Reasoning question on manipulating and simplifying expressions with radical terms.
Question 67:

$\dfrac{(\sqrt{2})(\sqrt{5})}{(\sqrt{7}-\sqrt{2}-\sqrt{5})(\sqrt{7}+\sqrt{2}+\sqrt{5})}=$

1. $\quad -2$

2. $\quad -1$

3. $\quad -\dfrac{1}{2}$

4. $\quad \dfrac{1}{2}$

5. $\quad 1$