Question: Who is the mayor of Yusa's birthplace?

full_context: Document 1: Lucrecia (singer): She was born in Santo Suarez neighborhood in Havana, and passed her childhood in Guanabacoa, a township within the province of La Habana.
Document 2: Juanita du Plessis: Juanita du Plessis (née Naude) is a famous Afrikaans country singer, born on 26 April in Windhoek, Namibia. She became known for her song "Ska-Rumba". Du Plessis' singing career began in 1998 with her debut album "Juanita". That year she won the CMA (Country Music Association in Namibia) awards as best singer, best songwriter and the Association’s Award for outstanding achievement.
Document 3: Buena Vista Social Club: Buena Vista Social Club Genres Son, bolero, guajira, danzón Years active 1996 -- present Labels World Circuit Nonesuch Elektra Records Members Jesús ``Aguaje ''Ramos Eliades Ochoa Omara Portuondo Barbarito Torres Papi Oviedo Manuel`` Guajiro'' Mirabal Guajirito Mirabal Luis Alemany Rolando Luna Pedro Pablo Filiberto Sánchez Alberto La Noche Andrés Coayo Idania Valdés Carlos Calunga Past members Compay Segundo Rubén González Ibrahim Ferrer Pío Leyva Angá Díaz Orlando ``Cachaíto ''López Manuel Galbán Manuel`` Puntillita'' Licea Juan de Marcos González Ry Cooder Joachim Cooder Amadito Valdés Alberto ``Virgilio ''Valdés Lázaro Villa Julienne Oviedo Sánchez Luis Barzaga Carlos González
Document 4: 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 5: 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 6: 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 7: 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 8: 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 9: 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 10: 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 11: 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 12: Alex Cuba (album): Alex Cuba is the third studio album released by Cuban-Canadian singer-songwriter Alex Cuba. It was released in Canada in 2009, and in the US in 2010. The album was nominated for a Latin Grammy in 2010, for Best Male Pop Vocal Album. In 2011, it was nominated for a Grammy Award for Best Latin Pop Album.
Document 13: 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 14: 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 15: Celia Cruz: Úrsula Hilaria Celia de la Caridad Cruz Alfonso (October 21, 1925 -- July 16, 2003), better known as Celia Cruz, was a Cuban singer of Latin music. She was known for her powerful voice and her rhythm - centric musical style. She was the most popular Latin artist of the 20th century, gaining twenty - three gold albums during her career. US President Bill Clinton awarded her the National Medal of Arts in 1994. She was renowned internationally as the ``Queen of Salsa '',`` La Guarachera de Cuba'', as well as The Queen of Latin Music.
ground_truth: Marta Hernández Romero
sub_queries: Yusa >> place of birth Answer: Havana
Who was in charge of Havana ? Answer: Marta Hernández Romero