Question: Hits 55 is a compilation album released in the UK released in April 2003, it contains 40 tracks spread over how many CDs, including five number one singles from Elvis Presley?

Context paragraphs:
Hits 53: Hits 53 is a compilation album released in the UK in July 2002.  It contains 41 tracks over two CDs, including four number one singles on the UK Singles Chart from Gareth Gates, Will Young, Holly Valance, and Liberty X.

Elvis Presley: Elvis Aaron Presley (January 8, 1935 – August 16, 1977) was an American singer, dancer and actor.  Regarded as one of the most significant cultural icons of the 20th century, he is often referred to as the "King of Rock and Roll" or simply "the King".

Hits 54: Hits 54 is a compilation album released in the UK in October 2002.  It contains 40 tracks over two CDs, including three number one singles on the UK Singles Chart from Will Young & Gareth Gates, Las Ketchup, and Blazin' Squad.

Hits 51: Hits 51 is a compilation album released in the UK in December 2001.  It contains 50 tracks over two CDs, including two number one singles on the UK Singles Chart from Westlife and Bob The Builder.  Bob The Builder's Mambo No. 5 appeared on Hits 50 as well in its original version by Lou Bega, and De Nada's Bring it On to My Love would later appear again on Hits 52

Hits 52: Hits 52 is a compilation album released in the UK in March 2002.  It contains 40 tracks over two CDs, including three number one singles on the UK Singles Chart from Will Young, Westlife, and Daniel Bedingfield.

Hits 58: Hits 58 is a compilation album, released in the UK in May 2004.  It contains 40 chart hits spread over two CDS, including UK number ones from Busted, Britney Spears and Peter Andre.  It was released around the same time as the similar Now 57.

Hits 56: Hits 56 is a compilation album released in the UK in July 2003.  It contains 40 tracks spread over two CDs, and features one number one single from Tomcraft.

Hits 55: Hits 55 is a compilation album released in the UK released in April 2003.  It contains 40 tracks spread over two CDs, including five number one singles from Christina Aguilera, Gareth Gates, Darius Danesh, DJ Sammy, and Elvis Presley vs. JXL

Hits 59: Hits 59 is compilation album released in the UK in August 2004 by Sony Records.  It contains 40 chart hits, including five number-one singles from Natasha Bedingfield, Brian McFadden, Usher, Britney Spears, and Eamon.

Hits 50: Hits 50 is a compilation album released in the United Kingdom in August 2001.  It contains 50 tracks spread over two CDs, including nine number-one singles on the UK Singles Chart from Five, DJ Pied Piper and the Masters of Ceremonies, Craig David, Jennifer Lopez, Bob The Builder, Rui Da Silva, LeAnn Rimes, A1, and Westlife.

Supporting paragraphs: Hits 55 Elvis Presley
Answer: two