Read the following context and choose the best option to answer the question.
Context: 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 .
Question: Where does John work ?
Options: 
- An in vitro fertility clinic .
 - At an animal hospital .
 - None of the above choices .
 - In agriculture .


In agriculture .