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: FIRST AID 
Clue: If this is not severe, it can often be controlled by direct pressure
bleeding

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: LABOR 
Clue: Fired in 1976, in 1980 striking workers got him reinstated at the Lenin shipyard in Gdansk

lech walesa