Question: Lydia Diaz Cruz trained with a prima ballerina who danced with what company?

Context paragraphs:
Prima ballerina assoluta: 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.

Mia Slavenska: Mia Slavenska (February 20, 1916 in Slavonski Brod – October 5, 2002 in Los Angeles), birth name Mia Čorak, was a Croatian-born American prima ballerina.  She formed the "Slavenska Ballette Variante" and, later, the "Theatre Ballette".  In 1954, she became the prima ballerina of the Metropolitan Opera Ballet.

Lisa Macuja-Elizalde: 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.

Lydia Díaz Cruz: Lydia Diaz Cruz is a Prima Ballerina who started dancing in Havana, Cuba, and trained with Fernando Alonso and Alicia Alonso.  As a young dancer, she was talent-spotted by a well-known British dancer and teacher from an earlier era, Dame Phyllis Bedells, who traveled to Cuba and regarded her as the most naturally gifted dancer she'd seen since Margot Fonteyn.  Early marriage and exile from Cuba in the wake of the Castro revolution put a halt to her career, which she resumed after the birth of her third child in the early sixties.  She went on to dance in the United States with Ballet Concerto in Miami, became principal dancer with the National Ballet of Washington, D.C., and has performed in principal guest roles with the National Ballet of Venezuela, Washington Ballet, Ballet Spectacular.  She danced alongside many of the great artists of the day, including Margot Fonteyn and Melissa Hayden, among many others.

Maya Plisetskaya: Maya Mikhailovna Plisetskaya (Russian: Ма́йя Миха́йловна Плисе́цкая ; 20 November 1925 – 2 May 2015) was a Soviet-born ballet dancer, choreographer, ballet director, and actress, who held Spanish and Lithuanian citizenship.  She danced during the Soviet era at the same time as Galina Ulanova, another famed Russian ballerina.  In 1960 she ascended to Ulanova's former title as prima ballerina assoluta of the Bolshoi.

Alessandra Ferri: Alessandra Ferri (born 6 May 1963) is an Italian prima ballerina.  She danced with the Royal Ballet (1980–1984), American Ballet Theatre (1985–2007) and La Scala Theatre Ballet (1992–2007) and as an international guest artist, before temporally retiring on 10 August 2007, aged 44, then returning in 2013.  She was eventually granted the rank of Prima ballerina assoluta.

Lida Martinoli: Lida Martinoli (1914–1991) was an Argentine dancer, choreographer, and theatre performer in Buenos Aires.  Born in Rosario, Santa Fe in 1914, she was the daughter of the artists, Fanny Montiano and Carlos Martinoli.  She studied ballet at La Scala in Milan before returning to Buenos Aires in 1932.  She joined the corps de ballet of the Teatro Colón, where she danced until 1956.  At the Teatro Colón, she served as prima ballerina during the 1940s.  In 1953, as prima ballerina for Teatro Colón, she performed at Carnegie Hall.  When she retired from dancing, Martinoli began to choreograph.  She died in Santa Fe.

Melania Ballish Regueiro: 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.

Phyllis Spira: 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".

Alicia Alonso: Alicia Alonso (born Alicia Ernestina de la Caridad Martínez Hoya; 21 December 1920) is a Cuban prima ballerina assoluta and choreographer.  Her company became the Ballet Nacional de Cuba in 1955.

Supporting paragraphs: Lydia Díaz Cruz Alicia Alonso
Answer: Ballet Nacional de Cuba