What is a career grand slam in professional golf?
A career grand slam is achieved when a professional golfer is able to win all of golf's major championships. These four tournaments are the Masters Tournament, the PGA Championship, the U.S. Open, and The Open Championship. No golfer in the modern era has ever completed a grand slam in the same calendar year.
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.
### Instruction: What is a career grand slam in professional golf?
### Input: 
### Response: A career grand slam is achieved when a professional golfer is able to win all of golf's major championships. These four tournaments are the Masters Tournament, the PGA Championship, the U.S. Open, and The Open Championship. No golfer in the modern era has ever completed a grand slam in the same calendar year.