Answer the following question: Information:  - Mira Aroyo (born July 11, 1977) is a Bulgarian musician, known as the secondary vocalist and one of the keyboardists and songwriters of the electronic band Ladytron, as well as a DJ. She writes and sings her songs for Ladytron in Bulgarian as well as English. Prior to a full-time career in music, Aroyo studied for a D.Phil. in genetics at the University of Oxford.  - Liverpool, in North West England, is a major city and metropolitan borough with an estimated population of 478,580 in 2015 within the City of Liverpool. Liverpool and its surrounding areas form the fifth largest metropolitan area in the UK, with an estimated population of over 2.24 million in 2011. The local authority is Liverpool City Council, which is the most populous local government district within the metropolitan county of Merseyside and the largest within the Liverpool City Region.  - Ladytron are an electronic band formed in Liverpool in 1999. The group consists of Helen Marnie (lead vocals, synthesizers), Mira Aroyo (vocals, synthesizers), Daniel Hunt (synthesizers, guitar, vocals) and Reuben Wu (synthesizers).  - Helen Marnie (born in 1978) is a Scottish musician, known as the lead vocalist and one of the keyboardists and songwriters of the electronic band Ladytron. In 2012, she started a solo career as Marnie and released her debut solo album "Crystal World" on 11 June 2013. Her second solo album, "Strange Words and Weird Wars", will be released on 25 March 2017.  - Helen Marnie is a Scottish musician , known as the lead vocalist and one of the keyboardists and songwriters of the electronic band Ladytron . In 2012 , she started a solo career as Marnie and released her debut solo album Crystal World on 11 June 2013 .  - Reuben Wu (born 1975) is a British photographer, director, musician and member of the electronic band Ladytron. His role in the band is keyboardist, songwriter and producer.     What entity does 'helen marnie' has the relation 'date of birth' with?
Answer:
1978