John was in the fertilized egg business . He had several hundred young laying hens , called " pullets " , and ten roosters to fertilize the eggs . He kept records , and any rooster not performing went into the soup pot and was replaced . This took a lot of time , so he bought some tiny bells and attached them to his roosters .

Available options: + An in vitro fertility clinic .. + At an animal hospital .. + None of the above choices .. + In agriculture ..
Answer the following question: Where does John work ?
In agriculture .