You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For consistency, answers should be in all lower cased letters.

Category: BORE & GUSH 
Clue: This company now better known for motor oil takes its name from the state where petroleum was found in 1859
pennzoil

Category: IT'S NOT SO 
Clue: Though 4,500 miles long, it's not visible from space, as its materials are similar in color to the surrounding soil
the great wall of china

Category: ROCK STARS 
Clue: This former member of Cream wrote his 1992 hit, "Tears In Heaven", for his son Conor

eric clapton