Kensuke Tanaka (田中 賢介, born May 20, 1981) is a Japanese professional baseball left fielder who plays for the Hokkaido Nippon Ham Fighters of the Nippon Professional Baseball League. He has played for the Hokkaido Nippon-Ham Fighters of Nippon Professional Baseball and the San Francisco Giants of Major League Baseball. Using only the above description and what you know about the world, "Tanaka has played baseball for 15 years. " is definitely correct, incorrect, or inconclusive? 