Question: P. V. Sindhu and Saina Nehwal are the only two Indian athletes to win an Olympic medal in which sport?

full_context: Document 1: Lee Chong Wei career statistics: This is a list of the main career statistics of Malaysian professional badminton player, Lee Chong Wei. To date, Lee has won sixty three singles titles, including eleven Super Series Premier titles, twenty-eight Super Series titles, and four Super Series Finals titles. He is the first men's singles player to win at least once in different Super Series Premier titles. He is also a Silver medalist at the 2008 Summer Olympics, 2012 Summer Olympics and the 2016 Summer Olympics. He is the runner-up at the 2011 BWF World Championships, 2013 BWF World Championships and 2015 BWF World Championships. His achievement as the runner-up at the 2014 BWF World Championships was canceled due to doping violations. Following that matter, he served an 8-month suspension from international competitions.
Document 2: Woon Khe Wei: Janice Woon Khe Wei (born 18 March 1989) is a Malaysian professional badminton player in the doubles event. Her current partner is Vivian Hoo Kah Mun. Together, they have ranked as high as No. 9 worldwide. Being a regular women's doubles player in super series tournament, Woon has achieved success with Hoo. They won a gold medal at 2014 Commonwealth Games in Glasgow and they also reached the quarterfinals in the 2016 Rio Olympics.
Document 3: Valiyaveetil Diju: Valiyaveetil Diju (Malayalam: വലിയവീട്ടില്‍ ദിജു ; born 4 January 1981), also known as V. Diju, is an Indian badminton player from Kozhikode, Kerala. He, along with partner Jwala Gutta, is the current national mixed-doubles champions and the pair are currently ranked 7th in the world by Badminton World Federation. He is the winner of Arjuna Award 2014, given by the Ministry of Youth Affairs and Sports, government of India to recognize his outstanding achievement in National sports. He is also the winner of G. V. Raja awards, which is the highest government-level recognition for sports persons in Kerala. He is winner of Jimmy George award 2014.He is also winner of Vivekanandha sports excellence award 2014. He won the Youth excellence award also in 2014. He is only the second badminton player from the state, after Vimal Kumar, to represent India in Olympics.
Document 4: Petra Kvitová career statistics: This is a list of the main career statistics of Czech professional tennis player Petra Kvitová. To date, Kvitová has won 20 singles titles including two Grand Slam singles titles at the Wimbledon Championships, one WTA Tour Championships singles title, two WTA Premier Mandatory singles titles and four WTA Premier 5 singles titles. She was also the bronze medallist at the 2016 Rio Olympics, a semifinalist at the 2010 Wimbledon Championships, 2012 Australian Open and 2012 French Open and a quarterfinalist at the 2011 Australian Open, 2012 Wimbledon Championships, 2013 Wimbledon Championships, 2015 US Open and 2017 US Open. Kvitová reached her career-high ranking of world no. 2 on 31 October 2011.
Document 5: Sania Mirza: Sania Mirza (] ; born 15 November 1986) is an Indian professional tennis player who was formerly ranked No. 1 in the women's doubles rankings. From 2003 until her retirement from singles in 2013, she was ranked by the Women's Tennis Association as India's No. 1 player, both in singles and doubles. Throughout her career, Mirza has established herself as the most successful female Indian tennis player ever and one of the highest-paid and high-profile athletes in the country.
Document 6: Saina Nehwal: Saina Nehwal (   ; born 17 March 1990) is an Indian professional badminton singles player. She is one of the greatest players of her time. Nehwal, the former world no. 1 has won over twenty one international titles, which include ten Superseries titles. Although she reached to the world no. 2 ranking in 2009, it was only in 2015 that she was able to attain the world no. 1 ranking. And thereby becoming the only female player from India and overall the second Indian player – after Prakash Padukone – to achieve this feat. She has represented India three times in the Olympics, winning bronze medal in her second appearance.
Document 7: Untitled Saina Nehwal Biopic: Untitled Saina Nehwal Biopic is an upcoming 2018 sports biopic based on the former World's no.1 Badminton Player, "Saina Nehwal". The character of Saina Nehwal is portrayed by Bollywood Actress Shraddha Kapoor. The movie is directed by Amole Gupte and produced by Bhushan Kumar and Krishan Kumar under the banner of T-Series.
Document 8: Li Na: Li Na (; ; born 26 February 1982) is a retired Chinese professional tennis player, who achieved a career-high WTA-ranking of world No. 2 on 17 February 2014. Over the course of her career, Li won seven WTA singles titles and two Grand Slam singles titles at the 2011 French Open and 2014 Australian Open. Li's rise to prominence came after those victories, which made her the first and only Grand Slam singles champion from East Asia and Asia as a whole. Prior to this, she had already become the first player representing an East Asian and Asian country to appear in a Grand Slam singles final, a milestone she achieved at the 2011 Australian Open. Li was also the runner-up at the 2013 Australian Open and 2013 WTA Tour Championships, a three-time quarterfinalist at Wimbledon and a semifinalist at the 2008 Beijing Olympic Games and 2013 US Open. Among her other most notable accolades, she was the first Chinese player to win a WTA tour title at the Guangzhou International Women's Open in 2004, the first to reach a Grand Slam singles quarterfinal at the 2006 Wimbledon Championships, and the first to break into the world's top 10. Her feats have sparked a major population growth of tennis players in East Asia, earning her the reputation as the region's tennis pioneer and trailblazer.
Document 9: Peng Shuai: Peng Shuai (; ; born 8 January 1986) is a Chinese professional female tennis player. She reached a career high ranking of World No. 1 in doubles by the Women's Tennis Association on 17 February 2014, making her the first Chinese professional tennis player (male or female, and in singles or doubles) to reach World No. 1. She won a gold medal at the 2010 Asian Games, defeating Akgul Amanmuradova in the final. At the 2013 Wimbledon Championships, Peng won her first ladies' double championship with Hsieh Su-wei of Taiwan and again won at the 2014 French Open with Hsieh.
Document 10: Carolina Marín: Carolina María Marín Martín (born 15 June 1993) is a professional badminton player from Spain. She is the Olympic Champion, two time World Champion, three time European Champion and the former World No.1 in BWF rankings for the badminton women's singles. Carolina Marin is currently ranked No. 4 in the World by Badminton World Federation. She became the World Champion in women's singles two times in a row in 2014 and 2015. She won her first Olympics gold medal in women's singles at the 2016 Rio Olympics after defeating P. V. Sindhu of India.
Document 11: P. V. Sindhu: Pusarla Venkata Sindhu (born 5 July 1995) is an Indian professional badminton player, who is currently world no 2 in the BWF World Ranking. At the 2016 Summer Olympics, she became the first Indian woman to win an Olympic silver medal. She is one of the two Indian badminton players to ever win an Olympic medal – other being Saina Nehwal. She was also a silver medalist at the 2017 BWF World Championships and, in 2017, became first Indian ever to win Korea Open Super Series.
Document 12: Vishnu Vardhan: Vishnu Vardhan (born 27 July 1987), also known as J. Vishnuvardhan, is a professional tennis player from India, ranked in the top 300 on the ATP Tour as of 9 July 2012. He was a member of the bronze medalist Indian men's team for 2010 Asian games in Guangzhou, China. He paired-up with and Sania Mirza for mixed doubles and won silver medal. He won the national singles title for the fourth time by winning the Men's final of Fenesta Open tennis Championship on October 8, 2016
Document 13: Martina Hingis: Martina Hingis (born 30 September 1980) is a Swiss professional tennis player, a former world No. 1 singles player and currently ranked world No. 2 in doubles by the WTA. She has spent a total of 209 weeks as the singles No. 1 and has won five Grand Slam singles titles, thirteen Grand Slam women's doubles titles, winning a calendar-year doubles Grand Slam in 1998, and seven Grand Slam mixed doubles titles; for a combined total of twenty-five major titles. In addition, she has won the season-ending WTA Championships two times in singles and three times in doubles, and an Olympic silver medal.
Document 14: Lin Dan: Lin Dan (born October 14, 1983) is a Chinese professional badminton player. He is a two-time Olympic champion, five-time World champion, as well as a six-time All England champion.
Document 15: Liliyana Natsir: Liliyana Natsir (born 9 September 1985) is an Indonesian female badminton player who specializes in doubles. With one gold and silver from Olympic Games and four gold medals at BWF World Championships, she is regarded as one of the greatest mixed doubles players in the history. She gained huge success by partnering with two different players. Her current partner is Tontowi Ahmad since 2011, after separating from her previous partner, Nova Widianto. She also won three titles in a row from 2012–2014 at All England Badminton Championships, one of the most prestigious and oldest tournament in the sport. Been entering the top level since 18 years old, her tactical awareness, game vision, and dominance at the front court are considered as one of the best in the tour. In 2016, she and Tontowi Ahmad became the first Indonesian mixed doubles pair to win gold medal at the Olympic Games by beating Chan Peng Soon and Goh Liu Ying of Malaysia.
ground_truth: badminton