Question: What is the capital of the county sharing border with the county having Post Oak, Virginia?

full_context: Document 1: WCUR: 91.7 WCUR FM "The Curve", also known as West Chester University Radio, is a college radio station that broadcasts in the Philadelphia area via a transmitter that covers a 5-mile radius around West Chester University in West Chester, Pennsylvania. WCUR offers a wide variety of music, news, sports, and specialty programming. WCUR is considered a free format station, and it does not require that DJs play within certain parameters. All undergraduate students of West Chester University are free to participate and become DJs. WCUR began as WCSC AM 64, a carrier current station only available on campus. The call sign WCUR was being used in 1974. In 1976 the on air slogan became 64CUR and a Part 15 FM transmission was added at .1 watt to serve the Sykes Student Union building and extend across the street to Killnger Hall. Efforts began at that time to seek a class A FM license, but funds were not approved. In the mid-1980s the station changed its call letters to WCUR AM 68, but it remained a carrier current station. In 1998, the station received a construction permit to build an FM station, and after installing a broadcast transmitter and antenna atop Sykes Student Union in the summer of 1999, the station signed on as WCUR 91.7 FM on September 1, 1999. Since 2001, WCUR also streams live on air from anywhere in the world from its website, www.wcur.org.
Document 2: WCNV: WCNV is a Public Radio formatted broadcast radio station licensed to Heathsville, Virginia, serving the Kilmarnock/Warsaw area. WCNV is owned and operated by Commonwealth Public Broadcasting Corporation and is a repeater station of WCVE-FM.
Document 3: Dunavant, Virginia: Dunavant is an unincorporated community in Spotsylvania County north of Chancellorsville, running along the Rapidan River and bordering Culpeper County in the state of Virginia. The Dunavant area comprises the extreme northern tip of Spotsylvania County. There are roughly 1,000 people in this community as of 2010.
Document 4: WSVO: WSVO (93.1 FM) is an Adult Contemporary formatted broadcast radio station licensed to Staunton, Virginia and serving Staunton and Augusta County, Virginia. WSVO is owned and operated by iHeartMedia.
Document 5: Postville, Wisconsin: Postville (formerly known as Stewart) is an unincorporated community located in the town of York, Green County, Wisconsin, United States.
Document 6: Oakton, Virginia: Oakton is a census-designated place (CDP) in Fairfax County, Virginia, United States. The population was 34,166 at the 2010 census. Oakton is an affluent community of Northern Virginia. Its center is west of Washington, D.C.
Document 7: WVYC: WVYC is a college radio station licensed by the Federal Communications Commission (FCC) to serve the community of York, Pennsylvania, United States. The station broadcasts from the Robert V. Iosue Student Union Building on the campus of York College of Pennsylvania in York.
Document 8: Thornburg, Virginia: Thornburg is an unincorporated community in Spotsylvania County in the U.S. state of Virginia. Thornburg is centered on the intersection of the Jefferson Davis Highway (U.S. 1) with Morris, Mudd Tavern, and South Roxbury Mill Roads. According to the Geographic Names Information System, Thornburg has also been known as Mudd Tavern and Thornsburg throughout its history. The town is located near Interstate 95 exit 118, where several motels and travel-related businesses exist.
Document 9: Paola's post: Paola's post, sometimes called Post Paola, in Miami County, Kansas, was located on the west side of Bull Creek, just west of Paola, Kansas. It was probably established in December 1861, as that was the first time it was mentioned. This post became one of the more important posts along the Kansas-Missouri border during the Civil War. It became a district headquarters in 1863. Later, in September 1864, it was designated a subdistrict headquarters, when the district headquarters was moved to Lawrence, Kansas. The military road from Fort Leavenworth to Fort Gibson ran through Paola, thus ensuring the post always had some importance.
Document 10: Post Oak, Virginia: Post Oak is an unincorporated community in Spotsylvania County in the U.S. state of Virginia. Post Oak is located near the intersection of Courthouse Road and Post Oak Road. Post Oak Middle School, Virginia and Spotsylvania High School are less than one-half mile away. A farm is next to Post Oak.
Document 11: Davenport, Virginia: Davenport is an unincorporated community in Buchanan County, Virginia, United States. Davenport is located on Virginia State Route 80 south of Grundy. Davenport has a post office with ZIP code 24239.
Document 12: WCVA (AM): WCVA is a broadcast radio station licensed to Culpeper, Virginia, serving Culpeper and Culpeper County, Virginia. WCVA is owned and operated by Piedmont Communications, Inc. and simulcasts the Classic Hits format of sister station 105.5 WOJL Louisa. Prior to February 2016, it had aired a satellite-fed Adult Standards format.
Document 13: Danville, West Virginia: Danville is a town in Boone County, West Virginia, United States. The population was 691 at the 2010 census. Danville was incorporated in 1911 and named for Dan Rock, the town's first postmaster. Danville was formerly known as Newport and Red House.
Document 14: Rapidan Historic District: Rapidan Historic District is a national historic district located at Rapidan, in Culpeper County and Orange County, Virginia. It encompasses 34 contributing buildings in the crossroads village of Rapidan. They include three churches, a post office, a commercial building, one meeting hall, two railroad depots, twenty-one residences, and six outbuildings. Notable buildings include the Emmanuel Episcopal Church (1874), "Annandale" (c. 1825), the Rapidan Trading Post (1903), Rapidan Post Office (1914), Lower Rapidan Baptist Church (1914), Rapidan Passenger Depot (c. 1890), and the Peyton-Grhby House (c. 1890). Also located in the district is the separately listed Waddell Memorial Presbyterian Church.
Document 15: Owens, Virginia: Owens is a small unincorporated crossroads community at the intersection of Dahlgren Road, Windsor Drive, and Owens Drive in King George County, Virginia, United States. State Routes 206 and 218 meet at this intersection, with 206 going east towards U.S. Route 301 and Dahlgren, 218 going south towards US 301 and Colonial Beach and 206 and 218 joined together going west towards Arnolds Corner and Fredericksburg. The eastern part of the community is within the Dahlgren census-designated place.
ground_truth: Culpeper, Virginia
sub_queries: Post Oak, Virginia >> located in the administrative territorial entity Answer: Spotsylvania County
Spotsylvania County >> shares border with Answer: Culpeper County
Culpeper County >> capital Answer: Culpeper, Virginia