Question: Who won the first two races of the triple crown?

Disambiguated questions and answers:
context: Big Brown did not finish in 2008.
question: Who won the first two races of the triple crown and not the third in 2008?
short_answers: Big Brown
wikipage: Triple Crown of Thoroughbred Racing (United States)

context: California Chrome finished 4th in 2014.
question: Who won the first two races of the triple crown and not the third in 2014?
short_answers: California Chrome
wikipage: Triple Crown of Thoroughbred Racing (United States)

context: I'll Have Another did not start (injury) 2012.
question: Who won the first two races of the triple crown and not the third in 2012?
short_answers: I'll Have Another
wikipage: Triple Crown of Thoroughbred Racing (United States)

context: American Pharoah, in addition to winning the 2015 Triple Crown, also won the Breeders' Cup Classic that year. As the Breeders' Cup was not established until 1984, American Pharoah was the first (and, as of 2018, only) horse to sweep all four races, a feat that came to be known as the Grand Slam.
question: Who won the first two races of the triple crown and also the third in 2015?
short_answers: American Pharoah
wikipage: Triple Crown of Thoroughbred Racing (United States)

context: Only one horse, Alydar, has placed (finished second) in all three races. He was defeated by Affirmed in all three races in 1978 by a combined margin of two lengths. His trainer John Veitch is the only trainer to have done this with one horse. In 1995, D. Wayne Lukas became the first and only major figure (owner, jockey, or trainer) to win all three Triple Crown races with different horses, Thunder Gulch in the Derby and Belmont, Timber Country in the Preakness. Lukas also is the only trainer to have won six straight Triple Crown races, adding his 1995 wins, having won the 1994 Preakness and Belmont with Tabasco Cat and the 1996 Derby with Grindstone.
question: Who won the first two races of the triple crown and also the third in 1978?
short_answers: Affirmed
wikipage: Triple Crown of Thoroughbred Racing (United States)

context: In the history of the Triple Crown, 13 horses have won all three races: Sir Barton (1919), Gallant Fox (1930), Omaha (1935), War Admiral (1937), Whirlaway (1941), Count Fleet (1943), Assault (1946), Citation (1948), Secretariat (1973), Seattle Slew (1977), Affirmed (1978), American Pharoah (2015), and Justify (2018). As of 2018, American Pharoah and Justify are the only living Triple Crown winners.
question: Who won the first two races of the triple crown and also the third in 1977?
short_answers: Seattle Slew
wikipage: Triple Crown of Thoroughbred Racing (United States)

Long answers:
knowledge: content: Big Brown (foaled April 10, 2005, in Kentucky) is a Champion American Thoroughbred racehorse who won the 2008 Kentucky Derby and 2008 Preakness Stakes and was the 2008 Champion Three-Year-Old.
wikipage: Big Brown

content: California Chrome (foaled February 18, 2011) is a champion American Thoroughbred racehorse who won the 2014 Kentucky Derby, Preakness Stakes, and 2016 Dubai World Cup.
wikipage: California Chrome

content: I'll Have Another (foaled April 1, 2009) is a champion American Thoroughbred racehorse who won the 2012 Kentucky Derby and Preakness Stakes.
wikipage: I'll Have Another
long_answer: In the history of the Triple Crown, 13 horses have won all three races, while other horses won only the first two races. Big Brown won the Triple Crown's first two races and not the third in 2008, while I'll Have Another did in 2012, and California Chrome did in 2014. Seattle Slew won the first, second, and third Triple Crown races in 1977, while Affirmed did in 1978, and American Pharoah did in 2015.