Task: Question Answering
Input (English): Passage: Inhabited on a mysterious island are strange creatures called Boggs who love meat. Unbeknownst to them, it is also inhabited by a shipwrecked boy. He scavenges for some food by distracting the Boggs with animal noises. Far away from the island, Odette and Derek are on their way to help the people by building a bridge leaving Alise in the care of Queen Uberta, Lord Rodgers, and their animals friends: Speed, Jean-Bob, Puffin and the Scullions. Queen Uberta begins to prepare Alise to learn how to be and act like a princess. But Alise doesn't want to be a princess in this way but to be a modern princess. Lord Rogers says that Alise needs adventure but Queen Uberta disagrees.
While fighting once again, Alise uses her chance to swim in the lake with her friends but she was quickly sent back to the palace to learn to be proper. Queen Uberta is very strict with Alise, trying to teach her everything, but instead she falls asleep and sent to bed. That same night, Lord Rogers, Jean-Bob, and Speed sneak Alise out of her room to go on an adventure.
The next morning, before Queen Uberta enters Alise's room with yoga lessons, she notices that Alise has gone with Lord Rogers. Queen Uberta chases after the group all the way to the port but they escape on a ship. Queen Uberta is furious but nervous about Alise so she sent Puffin and the Scullions after them.
On the ship, Alise changes into a pirate costume, making Lord Rogers realize that Uberta was right; he turned Alise into a pirate just when Alise wanted to have fun. On the first night they see the Polar Star and Lord Rogers says that sailors always used this star to guide the way back home. 
Question: Lord Rogers explains that sailors used what star as a means to guide themselves home?
Output (English): Polar Star.