With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The exact mechanism of Huntington's disease is unknown.
text_B: Billy Ray Brown -LRB- born April 5 , 1963 -RRB- is a former American professional golfer who played on the PGA Tour in the 1980s and 1990s , and a current on course reporter for Golf Channel and commentator for CBS Sports .. PGA Tour. PGA Tour. professional golfer. professional golfer. Golf Channel. Golf Channel. CBS Sports. CBS Sports. Brown was born , raised , and makes his home in Missouri City , Texas .. He attended the University of Houston , and was a member of the Cougar golf team .. Houston. Houston Cougars golf. University of Houston. Houston Cougars golf. Cougar golf team. Houston Cougars golf. He won the 1982 NCAA Division I Championship as a freshman .. NCAA Division I Championship. NCAA Division I Men's Golf Championships. He was also a member of the 1984 and 1985 national championship teams , and was an All-American all four years .. Brown won three PGA Tour events in a career cut short by an injury and subsequent surgeries to his wrist .. PGA Tour. PGA Tour. wrist. wrist. His best finish in a major championship was T-3 at the 1990 U.S. Open , one stroke out of the playoff .. 1990 U.S. Open ( golf ). major championship. Men's major golf championships. 1990 U.S. Open. 1990 U.S. Open ( golf ). He had 17 top-10 finishes in 315 PGA Tour events .. PGA Tour. PGA Tour. After his playing days ended , Brown moved into the media to serve as an on-course reporter for ABC Sports from 1999 until 2006 .. ABC Sports. PGA Tour on ABC. In 2007 , Brown joined the Golf Channel as an on-course reporter for their PGA Tour and Champions Tour coverage .. PGA Tour. PGA Tour. Golf Channel. Golf Channel. Champions Tour. Champions Tour
not_related.