Step 1: Definition of profitability ratios.
Profitability ratios are used to assess a company's ability to generate profit relative to its revenue, assets, or equity. Examples include Gross Profit Ratio, Net Profit Ratio, and Operating Ratio.
Step 2: The current ratio.
The Current Ratio is a liquidity ratio that measures a company's ability to pay short-term obligations and is not related to profitability.
Step 3: Conclusion.
Thus, the correct answer is (D) Current ratio.
Final Answer:
\[
\boxed{\text{Current ratio}}
\]