question: Who is the mother of the director of film Citizen Usa: A 50 State Road Trip?
context: [["Citizen USA: A 50 State Road Trip", ["Citizen USA:", "A 50 State Road Trip is an HBO documentary film directed by Alexandra Pelosi."]], ["Michiel Vos", ["Michiel Vos( born December 19, 1970) is a Dutch- American journalist, lawyer, jurist and United States- based correspondent.", "He is married to filmmaker Alexandra Pelosi, daughter of Speaker of the United States House of Representatives Nancy Pelosi.", "They met in Amsterdam when Vos was working for the broadcasting station VPRO, as a presenter for special film nights.", "The couple has two children.", "Vos hosts a Dutch/ Belgian TV series called\" My America\" about his experiences as a European living in America.", "The HBO film Citizen USA was based on Vos's journey to become an American Citizen.", "Vos worked as producer on the HBO films:\" The Trials of Ted Haggard\", and.", "His wife Alexandra Pelosi is the sister- in- law of Peter Kaufman, who is the son of filmmaker Philip Kaufman."]], ["Minamoto no Chikako", ["She was the mother of Prince Morinaga."]], ["Susan B. Nelson", ["Susan B. Nelson( April 13, 1927 \u2013 May 4, 2003) was an American environmental activist who is best known as the mother of the Santa Monica Mountains National Recreation Area."]], ["Trinidad Tecson", ["Trinidad Perez Tecson (November 18, 1848 \u2013 January 28, 1928), known as the \"Mother of Biak-na-Bato\" and \"Mother of Mercy\", fought to gain Philippines independence.", "She was given the title \"Mother of Biak-na-Bato\" by Gen. Emilio Aguinaldo.", "She was also cited as the \"Mother of the Philippine National Red Cross\" for her service to her fellow Katipuneros."]], ["Ian Barry (director)", ["Ian Barry is an Australian director of film and TV."]], ["Keku\u02bbiapoiwa II", ["Keku\u02bbiapoiwa II was a Hawaiian chiefess and the mother of the king Kamehameha I."]], ["Fatima bint Mubarak Al Ketbi", ["Fatima bint Mubarak Al Ketbi is the third wife of Sheikh Zayed bin Sultan Al Nahyan, the founder and inaugural president of United Arab Emirates, and late emir( ruler) of Abu Dhabi.", "She is referred to as the mother of sheikhs and as the Mother of the UAE."]], ["Peter Levin", ["Peter Levin is an American director of film, television and theatre."]], ["Alexandra Pelosi", ["Alexandra C. Pelosi (born October 5, 1970) is an American journalist, documentary filmmaker, and writer.", "She is a daughter of the Speaker of the United States House of Representatives Nancy Pelosi and Paul Pelosi."]]]
supporting_facts: [["Citizen USA: A 50 State Road Trip", 1], ["Alexandra Pelosi", 1]]
evidences: [["Citizen USA: A 50 State Road Trip", "director", "Alexandra Pelosi"], ["Alexandra Pelosi", "mother", "Nancy Pelosi"]]
answer: Nancy Pelosi