Question: Who is the mayor of the birth city of Mauricio Vallina

full_context: Document 1: Mauricio Vallina: Mauricio Vallina (born 1970 in Havana,) is a Cuban pianist living in Brussels. He has been a top prize-winner of national and international piano competitions. His prizes include Valencia (1994) and Gernika (1996) international piano competitions, and he has also been awarded special prizes for the best performance of Cuban and Spanish Music.
Document 2: Moisés Simons: Moisés Simons (born Moisés Simón Rodríguez; 24 August 1889 in Havana, Cuba – 28 June 1945 in Madrid, Spain), was a leading Cuban composer, pianist, and orchestra leader. He was the composer of "El Manisero" ("The Peanut Vendor" in English) which is considered by many to be the most famous piece of music created by a Cuban musician and has since been recorded by other musicians from around the world hundreds of times.
Document 3: Yusa: Yusa is a Cuban singer and songwriter, born in the Buena Vista district of Havana, Cuba. Her music is recognised worldwide : in 2003, she was nominated at the prestigious BBC Radio 3 World Music Awards in two categories (Best Newcomer and Best of the Americas.)
Document 4: Mexico City: The first elected head of government was Cuauhtémoc Cárdenas. Cárdenas resigned in 1999 to run in the 2000 presidential elections and designated Rosario Robles to succeed him, who became the first woman (elected or otherwise) to govern Mexico City. In 2000 Andrés Manuel López Obrador was elected, and resigned in 2005 to run in the 2006 presidential elections, Alejandro Encinas being designated by the Legislative Assembly to finish the term. In 2006, Marcelo Ebrard was elected for the 2006–2012 period.
Document 5: Carmen Cardinali Paoa: Chilean deputy Interior Minister Rodrigo Ubilla appointed Carmen Cardinali as Governor of Easter Island in early September 2010 to replace Edmunds. Cardinali's challenges included archeological preservation of the island's heritage and revamping the tourist industry. She served as a Governor until March 2014, being replaced by Marta Raquel Hotus Tuki, appointed by president Michelle Bachelet.
Document 6: Leslie Wright (pianist): Leslie Wright received his first piano lessons at just six years old. In 1953 he joined the Music Academy of Santa Cecilia in Rome. He graduated in 1960, winning first prize and jury mention. In 1961 he participated in the International Piano Competition in Geneva, taking third place. In 1962 he made a tour of several South American countries appearing in their best theaters and concert halls. In 1963 he won first prize in the "Biernans" competition in Paris. Shortly afterwards he was honored in the global contest of Bilbao from among 44 virtuoso pianists worldwide. In 1965 he won a major prize in the International Piano Competition "Marguerite Long", in Paris.
Document 7: Houston: The city of Houston has a strong mayoral form of municipal government. Houston is a home rule city and all municipal elections in the state of Texas are nonpartisan. The City's elected officials are the mayor, city controller and 16 members of the Houston City Council. The current mayor of Houston is Sylvester Turner, a Democrat elected on a nonpartisan ballot. Houston's mayor serves as the city's chief administrator, executive officer, and official representative, and is responsible for the general management of the city and for seeing that all laws and ordinances are enforced.
Document 8: James Behr: Pianist and composer James Behr is a graduate of The Juilliard School (MM and BM) and has performed throughout the U.S. Behr won first prize in the 2013 Bradshaw & Buono International Piano Competition featuring a solo performance at Carnegie Hall (Weill). He served as Classical Artist in Residence for The Florida Symphonic Pops (aka The Boca Raton Pops), performed on TV show "Talk of the Town," and was a featured soloist on radio, including WNYC and WXEL programs "Keyboard Artists" and "Morning Scherzo." A Steinway Artist and adjunct professor at Manhattan College, Behr has performed as solo pianist at Alice Tully Hall (Lincoln Center), The Chautauqua Festival, and as concerto soloist with The Virginia Symphony Orchestra, The Naples Philharmonic, The Miami City Ballet, and The North Miami Symphony. He received scholarship awards from Juilliard and The Chautauqua Music Festival. Behr was also a prizewinner in the Society of American Musicians Competition, IL; Cullowhee Music Festival Competition, NC; Boca Raton Music Guild Competition, FL; Five Towns Music Festival Competition, NY; and Chicago Music Club Piano Competition, IL.
Document 9: Miami: In recent years the city government, under Mayor Manny Diaz, has taken an ambitious stance in support of bicycling in Miami for both recreation and commuting. Every month, the city hosts "Bike Miami", where major streets in Downtown and Brickell are closed to automobiles, but left open for pedestrians and bicyclists. The event began in November 2008, and has doubled in popularity from 1,500 participants to about 3,000 in the October 2009 Bike Miami. This is the longest-running such event in the US. In October 2009, the city also approved an extensive 20-year plan for bike routes and paths around the city. The city has begun construction of bike routes as of late 2009, and ordinances requiring bike parking in all future construction in the city became mandatory as of October 2009.
Document 10: Havana: The current mayor of Havana ("President of the People's Power Provincial Assembly") is Marta Hernández Romero, she was elected on March 5, 2011.
Document 11: Marie Atkins: Marie Atkins was mayor of the Kingston and Saint Andrew Corporation (KSAC) from 1989 to 2003. Atkins was the third female mayor for Kingston & St. Andrew, Jamaica, and is the longest-serving mayor to date for Kingston & St. Andrew. She is the first Jamaican to become the president of the World Conference of Mayors.
Document 12: Andrés Manuel López Obrador: On 2 July  2000, he was elected Head of Government of the Federal District—a position akin to that of city mayor for the national capital district—with 38.3% of the vote.
Document 13: Cerro, Havana: Cerro is one of the 15 municipalities or boroughs ("municipios" in Spanish) in the city of Havana, Cuba. As of 2016 it is considered "one of Havana’s poorest municipalities."
Document 14: Viengsay Valdés: Born in Havana on November 10, 1976, Viengsay Valdés moved at three months to Laos, where her father was the Cuban Ambassador. At age three, her family moved to the Seychelles. At six, she moved back to Havana, Cuba, where her grandmother continued her education.
Document 15: Roberto Moya: He was born in Havana, Ciudad de la Habana. He won the bronze medal at the 1992 Summer Olympics in this event, and his personal best is 65.68.
ground_truth: Marta Hernández Romero
sub_queries: Mauricio Vallina >> place of birth Answer: Havana
Who was in charge of Havana ? Answer: Marta Hernández Romero