Given an trivia question precisely answer the question with a word/phrase/name. External resources such as Wikipedia could be used to obtain the facts.

Three of the Galilean moons of Jupiter are Io, Europa and Callisto. Which is the fourth?
ganymede

What is the correct name of the band who spent 14 weeks at No.1 with Macarena?
los del rio

In 1314, Robert the Bruce and a small Scottish army inflicted a massive defeat on a huge English army at Bannockburn. Who was the leader of the English forces ?
edward ii of england