Question: Who won the men's french open title?

Disambiguated questions and answers:
context: Rafael Nadal has won the most French Open titles, with twelve (which is also a record for any player, male or female, in any one of the four major tournaments) and also holds the record for the most consecutive wins in the Open Era, with five from 2010 to 2014. Max Decugis won eight French Championships prior to the Open Era. Michael Chang became the youngest player to win the French Open when he took the title in 1989 at . In contrast, André Vacherot is the oldest champion, having won in 1901 at 40 years old. In the Open era, this record belongs to Andrés Gimeno, who was 34 years and 9 months old when he won in 1972. French players have won the most French Open men's singles titles, with 38 victories, followed by Spanish (18) and Australian players (11). The current champion is Rafael Nadal who beat Dominic Thiem in the 2019 final to win his twelfth French Open title.
question: Who won the singles men's French Open title in 2017?
short_answers: Rafael Nadal
wikipage: List of French Open men's singles champions
context: American Jim Courier won consecutive titles in 1991 and 1992 before Spaniard Sergi Bruguera repeated the feat in 1993 and 1994. Gustavo Kuerten won three titles in 1997, 2000 and 2001. 2005 marked Rafael Nadal's first French Open; he won four consecutive titles from 2005 to 2008. Nadal was beaten in the round of 16 of the 2009 tournament by Robin Söderling who lost to Roger Federer in the final. Nadal regained the title in 2010 and defended his crowns in 2011, 2012, 2013, and 2014. In the 2015 event, he was knocked out in the quarter-finals by Novak Djokovic, who eventually lost in the final to Stan Wawrinka.
question: Who won the singles men's French Open title in 2016?
short_answers: Novak Djokovic
wikipage: List of French Open men's singles champions
context: American Jim Courier won consecutive titles in 1991 and 1992 before Spaniard Sergi Bruguera repeated the feat in 1993 and 1994. Gustavo Kuerten won three titles in 1997, 2000 and 2001. 2005 marked Rafael Nadal's first French Open; he won four consecutive titles from 2005 to 2008. Nadal was beaten in the round of 16 of the 2009 tournament by Robin Söderling who lost to Roger Federer in the final. Nadal regained the title in 2010 and defended his crowns in 2011, 2012, 2013, and 2014. In the 2015 event, he was knocked out in the quarter-finals by Novak Djokovic, who eventually lost in the final to Stan Wawrinka.
question: Who won the singles men's French Open title in 2015?
short_answers: Stan Wawrinka
wikipage: List of French Open men's singles champions
context: No context provided
question: Who won the doubles men's French Open title in 2017?
short_answers: Ryan Harrison
Michael Venus
context: No context provided
question: Who won the doubles men's French Open title in 2016?
short_answers: Marc López
Feliciano López
context: No context provided
question: Who won the doubles men's French Open title in 2015?
short_answers: Ivan Dodig
Marcelo Melo

Long-form answers:
knowledge: content: The French Open (French: Internationaux de France de Tennis), officially known as Roland-Garros (French: [ʁɔlɑ̃ ɡaʁos]), is a major tennis tournament held over two weeks at the Stade Roland-Garros in Paris, France, beginning in late May each year.
wikipage: French Open
long_answer: The French Open is a major tennis tournament held over two weeks at the Stade Roland-Garros in Paris, France. Rafael Nadal won the singles men's French Open title in 2017, Novak Djokovic in 2016 and Stan Wawrinka in 2015. Ryan Harrison and Michael Venus won the doubles men's French Open title in 2017. Marc López and Feliciano López won it in 2016 and Ivan Dodig and Marcelo Melo in 2015. 
knowledge: content: The French Open, also known as Roland-Garros, is an annual tennis tournament held over two weeks in May and June. Established in 1891 and played since 1928 on outdoor red clay courts at the Stade Roland Garros in Paris, France,[1] the French Open is (since 1925) one of the four Grand Slam tournaments played each year, the other three being the Australian Open, Wimbledon, and the US Open.
wikipage: List of French Open men's singles champions
long_answer: The French Open is an annual tennis tournament held over two weeks in May and June. The French Open is one of the four Grand Slam tournaments played each year, the other three being the Australian Open, Wimbledon, and the US Open. In 2015, Stan Wawrinka won the singles men's French Open title and Ivan Dodig and Marcelo Melo won the doubles title. In 2016, Novak Djokovic won the singles men's French Open title and Marc López and Feliciano López won the doubles title. In 2017, Rafael Nadal won the singles men's French Open title and Ryan Harrison and Michael Venus won the doubles title.