Question: What is the county seat for the county where East Brookfield Massachusetts is located?

Context paragraphs:
Quaboag Pond: Quaboag Pond is a 537 acre pond located near the East Brookfield and Brookfield, Massachusetts.  The pond lies about two miles (3 km) south of state Route 9 as it passes through East Brookfield.  Quaboag Pond was once named Podunk Pond.

East Brookfield &amp; Spencer Railroad: The East Brookfield & Spencer Railroad is a shortline railroad operated in East Brookfield, and Spencer, Massachusetts that serves the Northeast Automotive Intermodal Gateway.

Worcester County, Massachusetts: Worcester County is a county located in the U.S. state of Massachusetts.  As of the 2010 census, the population was 798,552, making it the second-most populous county in Massachusetts while also being the largest in area.  The largest city and traditional county seat is the city of Worcester.

Lake Lashaway: Lake Lashaway is a 293 acre pond located near the East Brookfield and North Brookfield, Massachusetts town line.  The town line cuts the lake approximately in half.  The lake lies just to the north of state Route 9 as it passes through East Brookfield.

Quaboag Plantation: Quaboag Plantation was a plantation founded in 1660 in Central Massachusetts that now makes up parts of the towns of Warren and New Braintree, as well as the whole towns of Brookfield, West Brookfield, North Brookfield, and East Brookfield.  In 1673, the plantation broke up as the various towns that made up its land became incorporated.

East Brookfield (CDP), Massachusetts: East Brookfield is a census-designated place (CDP) in the town of East Brookfield in Worcester County, Massachusetts, United States.  The population was 1,323 at the 2010 census.

Warren, Brookfield and Spencer Street Railway: The Warren, Brookfield and Spencer Street Railway is a former Massachusetts streetcar company that ran between Warren, and Spencer, Massachusetts, and passing through West Brookfield, Brookfield, and East Brookfield.  Service began in 1896, and ran at least until 1901, when service from the Worcester, Brookfield and Spencer Street Railway Company came to town.

East Brookfield, Massachusetts: East Brookfield is a town in Worcester County, Massachusetts, United States.  The population was 1,979 in a 2014 town census.  The census-designated place of East Brookfield (CDP) is located in the town.  The village of Union Chapel is also located in the town.

East Brookfield River: The East Brookfield River is a 2.4 mi river in Massachusetts that heads at Lake Lashaway in East Brookfield at an elevation of 614 ft above sea level.  It continues to Quaboag Pond, at an elevation of 594 ft .

Northeast Automotive Intermodal Gateway: The Northeast Automotive Intermodal Gateway is an intermodal freight transport facility located in East Brookfield, and Spencer, Massachusetts.  It is serviced by the shortline East Brookfield & Spencer Railroad, which operates just north of the CSX tracks.

Supporting paragraphs: East Brookfield, Massachusetts Worcester County, Massachusetts
Answer: Worcester