Title: Ada, Oklahoma
Content:  Ada is a city in and the county seat of Pontotoc County, Oklahoma, United States. The population was 16,810 at the 2010 census, an increase of 7.1 percent from the figure of 15,691 in 2000. The city was named for Ada Reed, the daughter of an early settler, and was incorporated in 1901. Ada is home to East Central University, and is the headquarters of the Chickasaw Nation. Ada is an Oklahoma Main Street City, an Oklahoma Certified City, and a Tree City USA member.
Title: Ada, Minnesota
Content:  Ada is a city in Norman County, Minnesota, United States. The population was 1,707 at the 2010 census. It is the county seat. Minnesota State Highways 9 and 200 are two of the main routes in the city.
Title: Ada, Oklahoma
Content:  Ada is located in the rolling hills of southeastern Oklahoma. Ada is 88 mi from Oklahoma City, 122 mi from Tulsa, and 133 mi from Dallas, Texas. According to the United States Census Bureau, the city has a total area of 15.8 sqmi, of which 15.7 sqmi is land and 0.1 sqmi (0.44%) is water.
Title: Ada, the National College for Digital Skills
Content:  Ada, the National College for Digital Skills. (Ada College) is a small college for further education in London, England, with campuses in Tottenham Hale and Whitechapel. It is named after Ada Lovelace and opened in September 2016. Its curriculum is designed with input from founding industry partners such as Bank of America Merrill Lynch, Gamesys, IBM, Deloitte, and King. Their founding education partner is the Aldridge Foundation. The Board is chaired by Tiffany Hall and Martha Lane Fox is Ada's Patron.
Title: Ada, Serbia
Content:  Ada (Ada) is a town and municipality located in the North Banat District of the autonomous province of Vojvodina, Serbia. It is situated near the river Tisa in the geographical region of Bačka. The town has a population of 9,564, while the municipality has 16,991 inhabitants (2011 census), and a 75.04% Hungarian majority. The municipality of Ada municipality includes the towns of Ada (the seat) and nearby Mol (Mohol), and the villages of Utrine (Törökfalu), Obornjača (Völgypart-Nagyvölgy) and Sterijino (Valkaisor).
Title: Ada, Kansas
Content:  Ada is an unincorporated community in Ottawa County, Kansas, United States. As of the 2020 census, the population of the community and nearby areas was 86.
Title: Ada Foah
Content:  Ada Foah is a town on the southeast coast of Ghana, where the Volta River meets the Atlantic Ocean. The town is located along the Volta River, off of the Accra-Aflao motorway. Known for palm-lined beaches and estuary islands, Ada Foah is also the capital of the Ada East District (formerly Dangme East District) and the seat of the District Assembly. 
Title: Ada, Ohio
Content:  Ada is the home of Ohio Northern University, a private University comprising five colleges: Arts and Sciences, Business Administration, Engineering, Pharmacy, and Law.
Title: Ada, Karaman
Content:  Ada (or Adaköy) is a village in the central district (Karaman) of Karaman Province, Turkey. At 36.9°N, 32.9°W it is situated in the mountainous area to the south east of Karaman. It is called Ada (meaning "island") because it is almost surrounded by creeks. Its distance to Karaman is 65 km. The population of the village was 435 as of 2011.
Title: Ada Health
Content:  Ada is a global health company based in Berlin that operates Ada, an end-user self-assessment app. Additionally, the company offers enterprise solutions - Assess, Connect, Handover, and COVID-19. It was founded by Claire Novorol, a British pediatrician, Martin Hirsch and Daniel Nathrath.

Question: What is Ada the capital of?
Answer: Pontotoc County.
Pontotoc County, Oklahoma.