Given a text passage, come up with an appropriate title for it. The title should accurately represent what the main focus of the passage is. The title of a passage may be present in the first few sentences of the passage and/or be referred to multiple times in the passage. The title should be 1-5 words long.

Example Input: Blood urea nitrogen ( BUN ) is a medical test that measures the amount of urea nitrogen found in blood . The liver produces urea in the urea cycle as a waste product of the digestion of protein . Normal human adult blood should contain between 6 and 20 mg of urea nitrogen per 100 ml ( 6 -- 20 mg / dL ) of blood . Individual laboratories will have different reference ranges as the assay used will vary between laboratories .
Example Output: Blood urea nitrogen

Example Input: `` More Than a Feeling '' is a song written by Tom Scholz and first released by American rock band Boston as the lead single from their self - titled debut album on Epic Records in September 1976 , with `` Smokin ' '' on the flipside . The single peaked at number five on the Billboard Hot 100 . The track is now a staple of classic rock and in 1999 it was named the 39th best hard rock song of all time by VH1 . It was included in the Rock and Roll Hall of Fame 's list of the 500 Songs That Shaped Rock and Roll , and was also ranked at Number 500 on Rolling Stone 's 2003 list of the 500 Greatest Songs of All Time , though it was dropped from the 2010 update .
Example Output: More Than a Feeling

Example Input: The Magic Flute ( German : Die Zauberflöte ) , K. 620 , is an opera in two acts by Wolfgang Amadeus Mozart to a German libretto by Emanuel Schikaneder . The work is in the form of a Singspiel , a popular form that included both singing and spoken dialogue . The work premiered on 30 September 1791 at Schikaneder 's theatre , the Freihaus - Theater auf der Wieden in Vienna , just two months before the composer 's premature death .
Example Output:
The Magic Flute