Question: What is the capital of the county where Grayson Valley is located?

full_context: Document 1: Rainsville, Alabama: Rainsville is a city in DeKalb County, Alabama, United States. At the 2010 census the population was 4,948, up from 4,499 in 2000. Rainsville is located on top of Sand Mountain, a southern extension of the Cumberland Plateau.
Document 2: WMRE: WMRE is a Sports formatted broadcast radio station licensed to Charles Town, West Virginia, serving Charles Town and Jefferson County, West Virginia. WMRE is owned and operated by iHeartMedia.
Document 3: Gray, Tennessee: Gray is a census-designated place (CDP) in Washington County, Tennessee, United States and a rural suburb of Johnson City. It is part of the Johnson City Metropolitan Statistical Area, which is a component of the Johnson City–Kingsport–Bristol, TN-VA Combined Statistical Area – commonly known as the "Tri-Cities" region. The population was 1,222 at the 2010 census.
Document 4: Grayson Valley, Alabama: Grayson Valley is an unincorporated community and census-designated place in Jefferson County, Alabama, United States. It is northwest from the Birmingham suburb of Trussville. At the 2010 census the population was 5,736.
Document 5: Red Bay, Alabama: Red Bay is a city in Franklin County, Alabama, United States. It was founded in 1907. The population was 3,158 at the 2010 census, down from 3,374 at the 2000 census. The town's name comes from the native red clay soil and the many bay trees (Persea borbonia) in the area.
Document 6: Grayson, California: Grayson is a census-designated place (CDP) in Stanislaus County, California, United States. The population was 952 at the 2010 census, down from 1,077 at the 2000 census. It is part of the Modesto Metropolitan Statistical Area.
Document 7: Graymoor-Devondale, Kentucky: Graymoor-Devondale is a home rule-class city in Jefferson County, Kentucky, United States. The city is the result of the merger of the former cities of Graymoor and Devondale. The population was 2,870 at the 2010 census.
Document 8: WKEE-FM: WKEE-FM is a Contemporary Hit Radio formatted broadcast radio station licensed to Huntington, West Virginia, serving Huntington, West Virginia, Ashland, Kentucky, and Ironton, Ohio. WKEE-FM is owned and operated by iHeartMedia, Inc.. WKEE-FM is the heritage CHR/Top 40 station in the Huntington area, having programmed hit music as a standalone FM for over 30 years (although its Top 40 heritage goes back to the early 1960s, when the station was a simulcast of WKEE-AM 800).
Document 9: WCWV: WCWV is a Contemporary Hit Radio formatted broadcast radio station licensed to Summersville, West Virginia, serving East-Central West Virginia. WCWV is owned and operated by Summit Media Broadcasting, LLC.
Document 10: WQBE-FM: WQBE-FM is one of two Charleston, West Virginia Country FM radio stations. WQBE is owned by Bristol Broadcasting Company of Bristol, Virginia, with a "twin" radio station WXBQ-FM in that area. WQBE also has another "twin" station WKYQ-FM in Paducah, Kentucky also owned by Bristol Broadcasting. WQBE broadcasts with an ERP of 50,000 watts. WQBE is the leader in the Arbitron rations in the Charleston Metropolitan Statistical Area. According to Bristol Broadcasting Company's website, WQBE's listening audience is strong in the 18 to 49 (male and female), and 25 to 54 (male and female) demographic ranges.
Document 11: Albertville, Alabama: Albertville is a city in Marshall County, Alabama, United States, and is included in the Huntsville-Decatur Combined Statistical Area. As of the 2010 census, the population of the city was 21,160.
Document 12: WQNT: WQNT is an American AM radio station licensed by the Federal Communications Commission (FCC) to Kirkman Broadcasting, Inc. to broadcast on 1450 kHz serving the community of Charleston, South Carolina. The station's programming format is classic hits. The station's studios are located in the West Ashley portion of Charleston and the transmitter site is in Charleston.
Document 13: WCHS (AM): WCHS is a News/Talk/Sports formatted broadcast radio station licensed to Charleston, West Virginia, serving Southern West Virginia and Southwestern West Virginia. WCHS is owned and operated by West Virginia Radio Corporation.
Document 14: Chelsea, Alabama: Chelsea is a city in Shelby County, Alabama, United States. It is part of the Birmingham metropolitan area. Chelsea was incorporated on March 1, 1996, with a population of 906. At the 2000 census the population was 2,949. According to the U.S. Census Bureau, the 2010 population for Chelsea was 10,183. Its seasonal campsite for visitors is Hargis Retreat which began in 1984. Chelsea is widely considered the fastest growing city in Shelby County, which is the fastest growing county in the state of Alabama.
Document 15: WKLP: WKLP is a Sports formatted broadcast radio station licensed to Keyser, West Virginia, serving Keyser, West Virginia and Mineral County, West Virginia. WKLP is owned and operated by West Virginia Radio Corporation.
ground_truth: Charles Town
sub_queries: Grayson Valley >> located in the administrative territorial entity Answer: Jefferson County
Jefferson County >> capital Answer: Charles Town