The expression \( x^3y^{-5} \) can be simplified using the property of exponents where \( y^{-n} = \frac{1}{y^n} \). Thus, we can rewrite the expression as follows:
\[ x^3y^{-5} = \frac{x^3}{y^5} \]
Therefore, the simplified form of the expression \( x^3y^{-5} \) is:
\[ \frac{x^3}{y^5} \]
So, the correct answer is:
\( \frac{x^3}{y^5} \)