Answer: key rate duration.

**Explanation:** **Key Rate Duration** is the correct answer because it specifically measures the sensitivity of a bond's price to changes in interest rates at specific maturity points along the yield curve. This differs from other duration measures: 1. **Key Rate Duration**: Measures price sensitivity to changes in specific key rates (e.g., 2-year, 5-year, 10-year rates) along the yield curve. This helps analyze non-parallel shifts in the yield curve. 2. **Effective Duration**: Measures price sensitivity to changes in the bond's yield to maturity, accounting for embedded options (like call or put options). It's calculated using option-adjusted pricing models. 3. **Modified Duration**: Measures price sensitivity to changes in yield to maturity for option-free bonds. It's derived from Macaulay duration and assumes a parallel shift in the yield curve. The question specifically mentions "a change in a specific maturity segment of the benchmark yield curve," which aligns perfectly with the definition of key rate duration.

Author: LeetQuiz .