Task: Question Answering
Input (English): Passage: In 2009, Gaga spent a record 150 weeks on the UK Singles Chart and became the most downloaded female act in a year in the US, with 11.1 million downloads sold, earning an entry in the Guinness Book of World Records. The Fame and The Fame Monster together have since sold more than 15 million copies worldwide. This success allowed Gaga to start her second worldwide concert tour, The Monster Ball Tour, and release The Remix, her final record with Cherrytree Records and among the best-selling remix albums of all time. The Monster Ball Tour ran from November 2009 to May 2011 and grossed $227.4 million, making it the highest-grossing concert tour for a debut headlining artist. Concerts performed at Madison Square Garden in New York City were filmed for an HBO television special, Lady Gaga Presents the Monster Ball Tour: At Madison Square Garden. Gaga also performed songs from her albums at the 2009 Royal Variety Performance, the 52nd Annual Grammy Awards, and the 2010 BRIT Awards. Before Michael Jackson's death, Gaga was set to take part in his canceled This Is It concert series at the O2 Arena in the UK.During this era, Gaga ventured into business, collaborating with consumer electronics company Monster Cable Products to create in-ear, jewel-encrusted headphones called Heartbeats by Lady Gaga. She also partnered with Polaroid in January 2010 as their creative director and announced a suite of photo-capture products called Grey Label. Her collaboration with her past record producer and ex-boyfriend Rob Fusari led to a lawsuit against her production team, Mermaid Music LLC. At this time, Gaga was tested borderline positive for lupus, but claimed not to be affected by the symptoms and hoped to maintain a healthy lifestyle. 
Question: What is the full name of the person whose collaboration with her past record producer and ex-boyfriend Rob Fusari led to a lawsuit against her production team?
Output (English): Lady Gaga.