Which state contains an area called the Bluegrass region?

The Bluegrass region is a distinctive area located in the central part of Kentucky, known for its rich soil, rolling hills, and a unique type of grass known as bluegrass. This region has historical and cultural significance, often associated with horse breeding, agriculture, and bluegrass music. The fertile land in the Bluegrass region has made it an important area for farming, especially for livestock and tobacco production.

Kentucky is notable for its sweeping landscapes and is often referred to as the "Bluegrass State," reflecting the importance of this region to the state's identity. The other states listed do not have a recognized area known specifically as the Bluegrass region, making Kentucky the correct and relevant choice for this question.