Who is the best golfer in the world?
The number one golfer in the official world golf rankings changes often and is determined by the OWGR scoring system. It is widely agreed upon that Tiger Woods is the best golfer ever to play the game, winning 15 major championships in an era with elite competition. Jack Nicklaus won 18 major championships but the competition when he won his major championships was not at the same level that Tiger Woods faced.
Instruction: Who is the best golfer in the world?
Context: 
Response: The number one golfer in the official world golf rankings changes often and is determined by the OWGR scoring system. It is widely agreed upon that Tiger Woods is the best golfer ever to play the game, winning 15 major championships in an era with elite competition. Jack Nicklaus won 18 major championships but the competition when he won his major championships was not at the same level that Tiger Woods faced.