Question: America's first major prima ballerina worked for which ballet company? 
Context: Dame Alicia Markova DBE (1 December 1910 – 2 December 2004) was an English ballerina and a choreographer, director and teacher of classical ballet.  Most noted for her career with Sergei Diaghilev's Ballets Russes and touring internationally, she was widely considered to be one of the greatest classical ballet dancers of the twentieth century.  She was the first British dancer to become the principal dancer of a ballet company and, with Dame Margot Fonteyn, is one of only two English dancers to be recognised as a prima ballerina assoluta.  Markova was a founder dancer of the Rambert Dance Company, The Royal Ballet and American Ballet Theatre, and was co-founder and director of the English National Ballet. Nicholas Magallanes (1922–1977) was a first-generation principal dancer with the New York City Ballet.  Along with Jerome Robbins, Francisco Moncion and Maria Tallchief, Magallanes was among the core group of dancers with which George Balanchine and Lincoln Kirstein formed the New York City Ballet (formerly "Ballet Society") in 1948.  Magallanes created the title rôle in Balanchine's "Orpheus" to music by Stravinsky, the ballet that marked the debut of the new company. Prima ballerina assoluta is a title awarded to the most notable of female ballet dancers. To be recognised as a "prima ballerina assoluta" is a rare honour, traditionally reserved only for the most exceptional dancers of their generation.  Originally inspired by the Italian ballet masters of the early Romantic ballet, and literally meaning "absolute first ballerina", the title was bestowed on a prima ballerina who was considered to be exceptionally talented, above the standard of other leading ballerinas.  The title is very rarely used today and recent uses have typically been symbolic, either in recognition of a prestigious international career, or for exceptional service to a particular ballet company.  There is no universal procedure for designating who may receive the title, which has led to dispute in the ballet community over who can legitimately claim it.  It is usually a ballet company that bestows the title, however some dancers have had the title officially sanctioned by a government or head of state, sometimes for political rather than artistic reasons.  Less common is for a dancer to become identified as a "prima ballerina assoluta" as a result of public and critical opinion. Lisa Teresita Pacheco Macuja-Elizalde (born October 3, 1964) is a Prima Ballerina.  In 1984, she became the first Filipina prima ballerina, and first foreign soloist to ever join the Kirov Ballet.  In the Philippines, she is the Artistic Director of Ballet Manila and Vice-Chairman of the Philippine UNESCO National Commission.  She was also the Commissioner of the National Commission on the Role of Filipino Women.  Macuja-Elizalde is also Directress and faculty member of the Ballet Manila School – a training center for ballet professionals who are steeped in the Russian Vaganova method. A retired Prima Ballerina.  Melania won the Bronze in the prestigious Brasilia International Dance Competition in 1992.  She left home at the age of 14 to join the Cuban National Youth Ballet Company.  In 1995 she joined the Volkstheater Rostock in Germany where she danced under Itchko Lazarov's direction.  In Rostock she was eventually promoted to Prima Ballerina.  She danced many principal roles including Carmen, Juliet, and Giselle. Ballet Manila is a classical ballet institution and dance company in the Philippines.  It currently highlights more than fifty highly trained dancers in the highly rigorous Russian (Vaganova) method of classical ballet.  Locally the company has performed in 47 cities holding more than 4,100 performances.  The company has done tours in Asia, Europe and North America, where it has held more than 140 performances.  The company is most notable for its in-house creative director, principal dancer and prima ballerina Lisa Macuja-Elizalde.  Along with Ballet Philippines and the Philippine Ballet Theatre, Ballet Manila is one of the three major ballet companies in the Philippines.  It regularly holds its performances at the Aliw theater and Star Theater, which are both located within Star City at Pasay City.  The concept of a ballet company by the dancers, of the dancers and for the dancers was the idea of Lisa Macuja-Elizalde when she, along with ballet master Osias Barroso and ten other dancers established Ballet Manila in 1995. Phyllis Spira (18 October 1943 – 11 March 2008) was a South African ballet dancer who began her career with the Royal Ballet in England.  Upon returning to South Africa, she spent twenty-eight years as "prima ballerina" of CAPAB Ballet, a professional company in Cape Town named for the Cape Performing Arts Board.  In 1984 she was named the first (and currently only) South African "Prima Ballerina Assoluta". Elizabeth Marie "Betty" Tall Chief (Osage family name: "Ki He Kah Stah Tsa"; January 24, 1925 – April 11, 2013) was an American ballerina.  She was considered America's first major prima ballerina, and was the first Native American to hold the rank. Tatiana Stepanova, also Tetyana Stepanova, (Russian: Татьяна Степанова ; Ukrainian: Тeтяна Степанова , "Tatiana Stepanova") (born, Odessa, Ukraine then Soviet Union) is a highly accomplished ballerina and choreographer.  She is now the Artistic Director of Stepanova Ballet Academy and Toronto International Ballet Theatre.  As Prima Ballerina of the Odessa State Ballet Company, she was awarded the honorary title of People's Artist of Ukraine for her excellence in the art of ballet. Konstanze Vernon (2 January 1939 – 21 January 2013) was a German ballet dancer, academic teacher and director of a ballet academy and a ballet company.  She was from 1963 to 1981 prima ballerina of the ballet at the Bayerische Staatsoper.  She taught at the Hochschule für Musik München and founded the ballet academy "Heinz-Bosl-Stiftung" in memory of her partner on stage Heinz Bosl.  After retiring from the stage, she was founding director of the now independent ballet company "Bayerisches Staatsballett".
Answer: New York City Ballet