Two teams are in the World Series, and you have to be on their rosters to play. They are not "chosen". At the shortest, the World Series will be four games, which will be long enough to use up the entire staring pitcher line-up, so everyone gets a turn.
Did you mean the All-Star Game? Pitchers do get chosen for the All-Star Game and are not voted. The manager who wins Manager of the Year Award gets to manage their All-Star team and select the pitchers for that year's game.
J.C. Romero was the winning pitcher in game 5 of the 2008 World Series.
Derek Lowe was the winning pitcher in game 4 of the 2004 World Series.
Boston Red Sox pitcher, John Lackey, was the losing pitcher in Game 2 of the 2013 World Series.
St. Louis Cardinals pitcher Michael Wacha was the winning pitcher of Game 2 of the 2013 World Series.
Whitey Ford has the most career World Series losses by a pitcher with 8.
Prior to the 2007 World Series, the last Red Sox pitcher to get a base hit in a World Series game was Bill Lee in Game 7 of the 1975 World Series.
Whitey Ford
Bob Gibson holds the World Series record for most strikeouts by a pitcher in a World Series (35 in 1968) and most strikeouts by a pitcher in a single game (17 in Game 1 of the 1968 WS). He is tied for most games won by a pitcher in a World Series (3 in 1967).
gibson
J.C. Romero of the Philadelphia Phillies was the winning pitcher in the final game of the 2008 World Series.
Tim Lincecum of the San Francisco Giants was the winning pitcher in the final game of the 2010 World Series.
Joe Blanton in Game 4 of the 2008 World Series against the Tampa Bay Rays. The previous pitcher to hit a HR in the World Series was Ken Holtzman of the Oakland Athletics in Game 4 of the 1974 World Series against the Los Angeles Dodgers.