Which college was Philip Rivers playing for when he entered the NFL?

Which college was Ben Roethlisberger playing for when he entered the NFL? What jersey number did Ben Roethlisberger wear with the Steelers? What position did Philip Rivers primarily play? Philip Rivers is best known for playing with which NFL team? What jersey number did Philip Rivers wear with the Chargers? What position did Eli Manning primarily play? Eli Manning is best known for playing with which NFL team? Which college was Eli Manning playing for when he entered the NFL?