Question: The Mercurial Vapor is a football boot endorsed by which Portuguese professional footballer who plays as a forward for Spanish club Real Madrid and the Portugal national team?
Context: The Mercurial Vapor is a football boot manufactured by Nike.  The boot is known for being lightweight.  Because of this, the boot is endorsed by many players for whom speed is part of their game, notably wingers or strikers, such as Cristiano Ronaldo, Franck Ribéry, Luiz Adriano, Zlatan Ibrahimović, Didier Drogba, Jesús Navas, Luka Modrić, Arturo Vidal, Douglas Costa, Xherdan Shaqiri, Raheem Sterling, Stephan El Shaarawy, Eden Hazard, Alexis Sánchez, Carlos Bacca and Philippe Coutinho, among others. Real Madrid C.F. is a Spanish professional association football club based in Madrid.  The club was formed in 1902 as "Madrid Football 'Club", and played its first competitive match on May 13, 1902, when it entered the semi-final of the Campeonato de Copa de S.M. Alfonso XIII.  Real Madrid currently plays in the Spanish La Liga.  Real Madrid was one of the founding members of La Liga in 1929, and is one of three clubs, including FC Barcelona and Athletic Bilbao, never to have been relegated from the league.  They have also been involved in European football ever since they became the first Spanish club to enter the European Cup in 1955, except for the 1977–78 and 1996–97 seasons. Ronaldo is a 2015 British documentary film directed by Anthony Wonke.  It follows the life and career of Portuguese footballer Cristiano Ronaldo, who currently plays for Spanish club Real Madrid and the Portugal national team.  The film was released worldwide on 9 November 2015.  A trailer for the film was released on 28 September 2015. André Filipe Tavares Gomes (] ; born 30 July 1993) is a Portuguese professional footballer who plays as a central midfielder for Spanish club FC Barcelona and the Portugal national team. Fábio Alexandre da Silva Coentrão (] ; born 11 March 1988) is a Portuguese professional footballer who plays for Sporting Clube de Portugal on loan from Real Madrid and the Portugal national team.  Mainly a left back he can also operate as a left winger, and occasionally as a defensive midfielder. Nélson Cabral Semedo (born 16 November 1993) is a Portuguese professional footballer who plays as a right-back for Spanish club FC Barcelona and the Portugal national team. Képler Laveran Lima Ferreira, (born 26 February 1983), commonly known as Pepe (] ), is a Portuguese professional footballer who plays for Turkish club Beşiktaş and the Portugal national team as a central defender.  During his professional career he has played for Marítimo, Porto and Real Madrid, with individual and team success with the latter two clubs.  He currently plays for Turkish side Beşiktaş.  An aggressive, physically strong and tenacious defender, Pepe is known for his hard-tackling style of play.  however, despite his defensive abilities, he has also drawn criticism in the press at times, due to his tendency to pick up cards, as he has occasionally shown violent or unsportsmanlike behaviour on the pitch. Guillermo Varela Olivera (] ; born 24 March 1993) is a Uruguayan professional footballer who plays as a right-back for Peñarol.  He began his career with Peñarol, in his home town of Montevideo, before joining Manchester United in 2013.  He spent time on loan to Spanish club Real Madrid's reserve team, Real Madrid Castilla, and at German club Eintracht Frankfurt, before rejoining Peñarol in 2017. Carlos Manuel Brito Leal Queiroz, (] ; born 1 March 1953), is a Portuguese football coach who is the current manager of the Iran national team.  He has also been the manager of the Portuguese national team and Spanish club Real Madrid, and was Alex Ferguson's assistant manager at English club Manchester United.  He has qualified three national teams to the World Cup, those being South Africa in 2002, Portugal in 2010, and Iran in 2014 and 2018. Cristiano Ronaldo dos Santos Aveiro (] ; born 5 February 1985) is a Portuguese professional footballer who plays as a forward for Spanish club Real Madrid and the Portugal national team.  Often considered the best player in the world and widely regarded as one of the greatest of all time, Ronaldo has four FIFA Ballon d'Or awards, the most for a European player, and is the first player in history to win four European Golden Shoes.  He has won 24 trophies in his career, including five league titles, four UEFA Champions League titles and one UEFA European Championship.  A prolific goalscorer, Ronaldo holds the records for most official goals scored in the top five European leagues (372), the UEFA Champions League (109) and the UEFA European Championship (29), as well as the most goals scored in a UEFA Champions League season (17).  He has scored more than 600 senior career goals for club and country.
Answer: Cristiano Ronaldo