Use reasoning to lead to the answer of the following question:
Where does illness happen?
Options:
- elderly person
- body
- brain
- stomach
- clothes
Reasoning process:
Body means the physical structure, including the bones, flesh and organs, of a person or an animal, where illness happens. Illness means a disease or period of sickness affecting the body and mind. Illness happens in a body. Therefore, the final answer is body.